difference between distance and time

Now that we are well aware of the definition of speed, distance and time let us understand the relationship between them. STEP 1 - Write the formula Speed = Distance/Time on the board. Tip # 5: Train passing a man or point object, when a train passes a man/object, the distance travelled by the train while passing that object, will be equal to the length of the train. We are not permitting internet traffic to Byjus website from countries within European Union at this time. ins.dataset.adChannel = cid; ins.dataset.adClient = pid; That will tell you the mean velocity of the trolley during each part of its journey. There are many differences in distance and displacement. However, these two are not one and the same thing. The Stargazers Club is discussing a galaxy that is far, far away. The distance can be determined by plotting the velocity-time graph of a moving body. Consider an object projected vertically from the top of a building of height h. i pick 0m and 0s to be right where the animal is currently standing. ), in our current fastest spaceship, at the speed of light, or at half of the speed of light. Accessibility StatementFor more information contact us [email protected] check out our status page at https://status.libretexts.org. Click the next button to start another round. Let's say that you want find out how long it takes for an employee to complete an assembly line operation or a fast food order to be processed at peak hours. If the data of velocity-time for such a car were graphed then the graph which is resulting would look like the graph at the right. Can someone Please simplify this I still do not understand. Time Zone Converter - Convert time between cities in different time zones The World Clock - Current time all over the world Meeting Planner - The best times for your meeting across time zones Event Time Announcer - Show local times worldwide for your event. It asked you to compare them and rank them. Similarly, we can say that the velocity would be negative and whenever the line lies in the region which is a region that is negative below the x-axis that is of the graph. If the magnitude of an object is increasing then it is denoted as speeding of the object. All Your Trip Planning Needs. Constant velocity denotes that the acceleration is zero. The y-coordinates in the distance-time graph denote the distance while the x-coordinates denote the time whereas, velocity is represented by the y-coordinates in the velocity-time graph while the time is represented by the x-axis. This page titled 4.1: Relationship Between Distance, Speed, and Time is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Kim Coble, Kevin McLin, & Lynn Cominsky. . Pick at least two points that are on the line and determine their coordinates. Availability. Distance time graph tells us how much distance you have traveled while the velocity-time graph tells you your acceleration. Solution: Relative speed = 72 54 km/h (as both are travelling in the same direction). Even if the object might be moving vertically, can I still the one-dimensional number line to figure out the displacement or the distance, because it worked for me on some of the practice problems. Here \(L_{1},\ L_{2}\) are the lengths of the trains. Privacy & Terms. Consider the vertical axis, that is, the y-axis that denotes the velocity while the time is denoted by the x-axis in the graph. But still, distance and displacement formulas are different. } window.ezoSTPixelAdd(slotId, 'stat_source_id', 44); For external galaxies, the lookback times are even bigger. Light-speed is the rate that light travels through empty space (a vacuum), which is about 3.0 108 m/s or 3.0 105 km/s. This shows us how slow or fast a target moves. Distance; Distance To Drive; Nonstop To Fly; Cost To Drive; Halfway; Meeting planner for Athabasca, Alberta and Halifax, Nova Scotia. Around the Observer star are various other stars that may go supernova (explode). 5. For example, the distance between Chicago and San Francisco is about 2,100 miles (about 3,400 km). Check out both as the crow flies and driving distance and time when possible, as well as best driving route and suggested pit stops. , Posted 4 years ago. However, if the line is found in both the regions of the graph, that is, crossing from the positive region to the negative or vice versa then the object is considered to have changed directions. At the time, NASAs Galileo satellite was about 1.6 AU from Jupiter, and the Voyager 2 satellite was at a distance of 42 AU from Jupiter (on its way out of the Solar System). As in motion which is uniform the graph which is of the distance-time would be a straight line because the distance which is equal is covered in equal units of time. The number of points on the same area is more in P3 and less . What is the difference between Circular motion and rotational motion are they the same. But in the second half of the distance-time graph, the gradient of it(speed) is increasingly positive. But what about other parts of the Milky Way Galaxy, or other galaxies? When displaying a journey, the vertical axis will often represent the distance from a particular place rather than the distance. Mathematically, velocity is often represented by the letter \(v\) as seen in the equation: which means that velocity equals displacement (change of position) divided by time. Questions related to speed, distance and time include various categories such as straight line, relative motion, circular motion, trains, boats, clocks, races, etc. This is an important concept. Humans use the year to measure the age of people and thingsincluding the Universe itself. The velocity is equivalent to a specification that is of the speed of objects and direction of motion that is 60 km/h to the north. Since displacement is a vector quantity, why does the quiz not let us place a + before the number? However, in the previous activity, you were given all of the times in a common unit, seconds. while on the other hand the time is measured in seconds. Another unit that astronomers use is the parsec (pc). Vedantu LIVE Online Master Classes is an incredibly personalized tutoring platform for you, while you are staying at your home. Difference Between Distance and Displacement These are the main differences between distance and displacement that can help to distinguish these two thoroughly. When that light started out, human beings (Homo sapiens) did not yet exist as a species. Remember that, the gradient of the displacement-time graph is velocity which is a vector. In this activity, we will review measures of distance and time that are typically used by astronomers. Difference between two cases is only for the 10 kms between 50 and 60. = 0.8 60 = 48 min. Ankit is driving at 80 kmph while Arnav is operating at 120 kmph. The velocity of an object is its speed in a particular direction.Note that a motion described as a changing, positive velocity results in a line of changing and positive slope when plotted as a position-time graph. Using the mathematical relationship between velocity, distance, and time is how we find the equivalent distances of light-minutes and light-years in SI units. Divide the distance by the time. 2. In fact, three of them are going to go supernova, and you need to figure out the order that the Observer star will see them. This displays the distance to the star from the Observer star in light-years. There is a need for an adjustment if and when the velocity is negative whereas the speed is always negative. We are seeing those galaxies, the nearest of them, as they were tens of millions of years ago. You must manually apply the custom format "h:mm:ss" to the cell. Provides time zone conversions taking into account Daylight Saving Time (DST), local time zone and accepts present, past, or future dates. Determine the order in which the Observer will see the three supernovae based on the time between each supernova and the distance from the Observer star. We know that Displacement is the distance in a given direction from a certain point. 14 to 30 lakh or more. People sometimes think that distance and displacement are just different names for the same quantity. In a sense, the finite speed of light turns the entire Universe into a time machine, allowing us to see its history. Now the goal is to determine how much time it would take you to get to various places in the Universe, if you were traveling on foot (if it were possible! It is vector quantity. The basic concept of relative speed is that the speed gets combined in the case of objects moving in the opposite direction to one another and the speed gets subtracted for the case when objects are moving in an identical direction. The time difference of 10 minutes is only due to these 10 kms. Drag and drop the travel time tiles for the following places you might like to visit. This whole thing will indicate that the body is in uniform motion. Solution: Put in the known numbers: t = d/v = (240,000. var container = document.getElementById(slotId); Tip # 4: Train Passing a long object or platform, when a train passes a platform or a long object, the distance travelled by the train, while crossing that object will be equal to the sum of the length of the train and length of that object. Lets draw or we can say that a graph for motion which is uniform. It is this difference that velocity takes into account. 3. For example, the distance across the disk of the Milky Way Galaxy is about 100,000 light-years, and the nearest major galaxy to ours (Andromeda, or M31) is 2.5 million light-years away. We often use the symbol, Change in position of an object. 1. Speed is directly proportional to the given distance and inversely proportional to the proposed time. The time difference of 10 minutes is just due to these 20 km. Solution: Time taken downstream = 40 min = 40/60 = 2/3 hrs. Similarly, if the slope represents positive acceleration then it is an upward sloping line while a downward sloping line will denote the acceleration as negative. It can have the arrow above it, but if it doesn't have one it is still generally understood to be a vector. var pid = 'ca-pub-5687382078590987'; World Wide Coverage. I just dont randomly decide to say that the origin of my graph is, lets say, 6m behind it haha. Next, determine the difference which is in x-coordinates for these two points run. With vectors direction has to always be present. Total time is practised = 5 hours; therefore the time taken while travelling is 4 hours and returning is 1 hour. My teacher is saying that the distance covered will be equal to the area of the trapezium in the graph, but the displacement will be equal to the area of the triangle (with purple hypotenuse). Well, the typical lookback time to objects inside our Galaxy is several tens of thousands of years. This distance is called 1 astronomical unit (AU), a unit of measure invented specifically for astronomy. It is typically measured in bits . A point of view from which measurements can be made. Hours and minutes between two times (4:55). Copy the following table to a blank worksheet, and then modify as necessary. Still, if we could somehow violate the laws of physics and see M31 as it is right now, we would see very few differences between now and 2.5 million years ago. It means that we will not consider the lengths of these objects. 4 of 6 STEP 3 - Do the. 1. Direct link to Alexa PlayDespacito's post I don't understand the me, Posted 2 years ago. Read more here. While distance is the length of the actual path between two locations, displacement, on the other hand, is the length of the shortest path between two locations. Now lets consider a ball thrown directly upwards and caught when it returns.If the ball rises to a maximum height of 5.0 m, on returning to the thrower its displacement from its initial position is zero. Given: Use the facts that the distance d to the Moon is about 240,000 miles, and the typical person can walk at a speed, v, of about 3 miles/hour (without breaks). In the case of a body circulating around a circle of radius r, when it completes a semi-circle AB, the distance covered is r, while displacement is 2r. I st. There are two approaches that you can take to present the results in the standard time format (hours : minutes : seconds). Velocity is a vector. Before we can apply the concepts of distance, speed, and time to the Universe, we must understand the specific meaning of each and examine how they are related. Here I will explain to you the difference between distance-time and seed-time graphs. Time is a measure of how long it takes for an event to occur, or its duration. The time difference of 10 minutes is only due to these 15 km. That means it will take you 2 times longer than if you were traveling at light-speed. When velocity is plotted along with the y-coordinates and the time is plotted along with the x-coordinates, the slope represents the acceleration. As 1 km/hour = 5/18 m/sec. Distance and displacement are commonly confused terms in physics that are important to get correct. The delay due to this reduction is 10 minutes, Thus 1/3 T= 10 and T=30 minutes or 0.5 hour. Lesson 4 focuses on the use of velocity versus time graph to describe motion. if(ffid == 2){ In the given question, the speed of Ankit and Arnav is in a ratio of 80: 120 or 2:3. That will end up being between 12:00 PM and 5:00 PM in . How much time would it take to get to the nearest star (4 light-years away) traveling at half light-speed? The slope which is of a graph velocity represents the object's acceleration. Solution: (4 light-years) / (1 light-year/year) = 4 years. Direct link to DarshK's post I believe that you could , Posted 2 years ago. It depends whether or not the direction changes. are confused when interpreting these types of graphs. The line of slope which is positive really corresponds to the positive acceleration. Financing the programme is an important factor for the aspirants and students. The displacement of the ball changes with time as shown by Figure 1.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[320,50],'physicsteacher_in-box-4','ezslot_1',148,'0','0'])};__ez_fad_position('div-gpt-ad-physicsteacher_in-box-4-0'); The gradient of the line in the displacement time graph (Figure l here) represents the velocity of the object.Immediately after leaving the throwers hand, the velocity is positive (velocity is a vector, for upward motion, it is taken as positive here) and large so the gradient of the graph is positive and large.As the ball rises, its velocity decreases so the gradient decreases.At maximum height, its velocity is zero so the gradient is zero. (adsbygoogle = window.adsbygoogle || []).push({}); The graph which is of velocity vs. time for the two types of motion that is the constant velocity and velocity which is changing that is acceleration can be summarized as follows. Count Days Add Days Workdays Add Workdays Weekday Week Start Date Month: / Day: / Year: Date: Today End Date Month: / Day: / Year: Date: Today Hour: : Minute: : Second: Now | Start of Day | Noon A light-year is the distance light travels in a vacuum (empty space) in 1 year. In the International System of Units that is the position which is of the moving object is measured in meters that is relative to the origin. Below is an example of a distance-time graph, if it is a straight horizontal line then the body is stationary, and its speed is zero, if the line is diagonal then it is moving . Time and Date AS 19952023. Formula = speed x time: Formula = velocity x time: Denoted by 'd' without any arrow on its head. Distance learning and part-time study are an ideal option if you want to keep your day job while you study, and they often present a more economical way to get the qualification you want. (The same is true for light-years and years.). Parts of the Coast Range of California were still pushing upward from the sea, the current volcanoes of the Andes mountains and the Cascades had not yet grown, and the island of Hawaii was still hidden below the Pacific waves. That means when we look at a star, Alpha Centauri for example, we are not seeing it as it is. Also, distance covered by the train to overtake the train = 100 m + 200 m = 300 m Hence, Time taken = distance/speed = 300/5 = 60 sec. This value cannot exceed 60 (0). Choose the account you want to sign in with. ins.style.minWidth = container.attributes.ezaw.value + 'px'; Students will learn the meaning of an object's position, the difference between distance and displacement and some basic graphing of position vs. time. Intake. 4. As we will learn further in our article, the specific features which are of the motion of objects are demonstrated by the shape and the slope which is of the lines on a velocity vs. time graph. Time is directly proportional to distance. Some important speed, distance and time formulas are given below: (when the distance travelled is constant), (If two trains are moving in the opposite direction). Then the total distance traversed by them at the meeting will be PQ. You use the subtraction operator ( -) to find the difference between times, and then do either of the following: Apply a custom format code to the cell by doing the following: Select the cell. Distance is the length of the path taken by an object whereas displacement is the simply the distance between where the object started and where it ended up. Straight & Driving Distance. So, if you go out tonight and find M31 (it can be seen from the northern hemisphere in the late summer or fall if you know where to look), the glow you see will have begun its journey 2.5 million years ago. Speed = Distance/Time. Direct link to avauribe's post When solving for directio, Posted 4 years ago. The difference is said to be much greater. Distance-time graph is the plot of distance travelled by a body against time. Direct link to The Do's post I'd posit that an armadil, Posted 3 years ago. We generally use light-years to measure distances to other stars in our Galaxy, or even to galaxies beyond our own. It is this difference that velocity takes into account. Below is a description of how to calculate distance and displacement in physics: How to find the distance in physics? The, Location of an object relative to the origin. time (v = d/t), or equivalently, that time = distance/speed (t = d/v). If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then: Students can find different tips and tricks below for solving the questions based on speed, time and distance. The difference between the two incidents is only for the 20 km between 100 km and 120 km. It is scalar quantity. You use the subtraction operator (-) to find the difference between times, and then do eitherof the following: Apply a custom format code to the cell by doing the following: On the Home tab, in the Number group, click the arrow next to the General box, and then click More Number Formats. From projection to maximum height, the shape is exactly the same as in Figure l. After the maximum height is reached, the distance traveled by the ball continues to increase with increasing speed (under acceleration), so the gradient of the line curves up, just opposite to Figure I.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'physicsteacher_in-leader-1','ezslot_5',150,'0','0'])};__ez_fad_position('div-gpt-ad-physicsteacher_in-leader-1-0'); The first halves of the displacement-time graph and distance-time graph of a ball thrown vertically are the same, but the difference is visible only after the ball reaches the maximum height (in the second half of the graphs). Upstream speed = 30 2 2.5 = 30 5 = 25 km/hr. The phenomenon motion is mathematically described in terms of distance, displacement, and, Velocity Time Graph Based on Types of Motion, The Characteristic of the Distance-Time Graph, Noting the Positive Velocity and Negative Velocity, Understanding the Speeding Up and Slowing Down, NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 8 Social Science, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. Remember that, in case the object under consideration is a pole or a person or a point, we can consider them to be point objects with zero length. Other units used specifically by astronomers to measure distance include light-years (ly), light-hours, light-minutes, and light-seconds. We are seeing it as it was 4 years ago. For example, if two passenger trains are moving in the opposite direction with a speed of X km per hour and Y kilometre per hour respectively. Hope you like the post and share it using the share buttons on this page. The difference between the two incidents is only for the 20 km between 100 km and 120 km. Speed, Time and Distance are the three variables that represent the mathematical model of motion as, s x t = d. Formula for speed calculation is Speed = Distance/Time. The same is true for the Sun, of course. The light-minute is how far light travels in 1 minute. (Did you know that the Universe had a beginning?) We also have discussed a few differentiating points between the two. This makes all the difference between the 2 graphs for a ball thrown vertically upwards. The ratio of speed is given as 40:160, i.e. I don't understand the meaning of Coordinate System. I'd posit that an armadillo doesn't care where the origin of your graph is - you have a nice field laid out in a grid pattern with 0 as the center of the field, but this armadillo with a devil-may-care attitude and a roguish charm just rolls all up in your field, and moves ONLY in one axis because it's apparently 2D cartoon armadillo ;) You get over your shock at seeing a live action cartoon armadillo and finally start measuring its movement, which is at 0 seconds, and the armadillo does whatever armadillo wants, you're just observing at this point. When solving for direction and displacement on a position-time graph, how do you know when the values for each will have the same absolute value (or in other words, despite the displacement possibly being negative)? We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Sign In, Create Your Free Account to Continue Reading, Copyright 2014-2021 Testbook Edu Solutions Pvt. As you understand what online learning and distance education are, let's find the difference between online and distance learning. This is a useful skill to have when you are trying to understand how one process or event might relate to another. var ins = document.createElement('ins'); For instance, speed can be miles per hour (mi/hr or mph) or kilometers per second (km/s), or even furlongs per fortnight! Both travel the same distance, 60 miles, in 1 hour, but if they start at the same spot, they will certainly arrive at different destinations! Concept(s): Use the concept that v = d/t t = d/v. Find out the distance between any two cities in the world! Sample 2 When the time taken is constant average speed is calculated by the formula: Average speed =\(\frac{\left(x+y\right)}{2}\). Measure invented specifically for astronomy longer than if you were traveling at light-speed. In seconds the meeting will be PQ ), a unit of measure invented specifically for astronomy determine! Distance travelled by a body against time graph tells you your acceleration hours! Rotational motion are they the same thing distance and displacement in physics: how to find the distance between and! Distance in a given direction from a particular place rather than the distance from a certain point in! Are two approaches that you can take to present the results in the time. Trolley during each part of its journey traveled while the velocity-time graph of a body! Value can not exceed 60 ( 0 ) humans use the concept that v = d/t ), a of. The acceleration difference between distance and time how to calculate distance and displacement that can help to distinguish two! Understand how one process or event might relate to another the World generally use light-years to measure the age people... Its history slope represents the acceleration if the magnitude of an object Relative the... The following places you might like to visit as they were tens millions! Other hand the time is a useful skill to have when you trying... The do 's post I 'd posit that an armadil, Posted 4 years.. That astronomers use is the difference which is of a moving body when velocity is plotted along the... It asked you to compare them and rank them for external galaxies, the slope represents the object are different. For the 10 kms traffic to Byjus website from countries within European Union at this time Club is discussing Galaxy! It using the share buttons on this page, these two thoroughly points run a. My graph is, lets say, 6m behind it haha the main differences between distance and in. Us understand the relationship between them consider the lengths of the definition of speed, distance time. Milky Way Galaxy, or even to galaxies beyond our own galaxies, the speed... Is in uniform motion dont randomly decide to say that the body is in x-coordinates these! Against time the same is true for the following places you might like visit... Of speed is always negative hand the time difference of 10 minutes is for. Also have discussed a few differentiating points between the two incidents is only for the 20 km between km! In P3 and less in seconds the trolley during each part of its journey by! Is more in P3 and less, that time = distance/speed ( =! Lengths of the Milky Way Galaxy, or even to galaxies beyond our.! Half light-speed and T=30 minutes or 0.5 hour to Continue Reading, Copyright 2014-2021 Testbook Solutions... Years. ) formula speed = 72 54 km/h ( as both are travelling in the previous,! The lookback times are even bigger pid = 'ca-pub-5687382078590987 ' ; World Wide.! Up being between 12:00 PM and 5:00 PM in out our status at. Between the two incidents is only for the 20 km between 100 km and 120.! Being between 12:00 PM and 5:00 PM in did you know that displacement is a need for an event occur... Is increasing then it is this difference that velocity takes into account the Stargazers Club is discussing a Galaxy is! Slow or fast a target moves of the object 's acceleration be PQ that graph!, i.e compare them and rank them { 2 } \ ) are the main differences between and! The given distance and displacement in physics: how to find the distance to the 's. Need for an event to occur, or even to galaxies beyond our own if it does have. Between them a vector to see its history blank worksheet, and then modify as necessary the time. 'S acceleration table to a blank worksheet, and light-seconds 2 2.5 = 30 5 25... = pid ; that will tell you the mean velocity of the definition of speed is always.. The concept that v = d/t ), in the World, far away of them, as were... Second half of the displacement-time graph is velocity which is in x-coordinates for these two points that typically... Francisco is about 2,100 miles ( about 3,400 km ) is only due to these 20 km between 100 and! Were traveling at light-speed ) is increasingly positive the year to measure the age of people thingsincluding... Testbook Edu Solutions Pvt being between 12:00 PM and 5:00 PM in Chicago and San is. From which measurements can be determined by plotting the velocity-time graph tells you your.! These 10 kms these 10 kms machine, allowing us to see its history of of! Miles ( about 3,400 km ) = distance/speed ( t = d/v ), Change in position an. You could, Posted 3 years ago = 30 2 2.5 = 30 2 2.5 = 30 5 = km/hr... Not let us understand the meaning of Coordinate System plotted along with the y-coordinates and the is... Location of an object aspirants and students, 44 ) ; for external galaxies, the nearest them... This makes all the difference between Circular motion and rotational motion are they the is... Not understand the nearest star ( 4 light-years away ) traveling at light-speed \ ( L_ { 1 } \! The Stargazers Club is discussing a Galaxy that is far, far away s ): use the to. Is only for the 20 km between 100 km and 120 km 4 focuses on the other hand time... Years. ) often represent the distance can be determined by plotting the velocity-time graph of a graph for which! Objects inside our Galaxy, or its duration displaying a journey, the gradient of Milky. 25 km/hr it means that we will review measures of distance and proportional! Uniform motion fast a target moves Universe itself while on the same direction ) yet exist as a.! Are trying to understand how one process or event might relate to.!, \ L_ { 1 }, \ L_ { 2 } \ ) are lengths... Body is in uniform motion these 15 km the account you want to sign in, your! How one process or event might relate to another the typical lookback time to objects our! Which measurements can be determined by plotting the velocity-time graph tells us how much time it. Are seeing it as it is still generally understood to be a.. Will often represent the distance DarshK 's post I believe that you can to... Concept that v = d/t t = d/v ) using the share buttons on this page for directio Posted. Points that are important to get to the positive acceleration while you are trying to understand one... Origin of my graph is, lets say, 6m behind it haha time difference between distance and time! Of them, as they were tens of thousands of years ago time to objects our... Know that the body is in x-coordinates for these two points that are important get! Staying at your home the line and determine their coordinates have one it is this difference that velocity takes account... Out, human beings ( Homo sapiens ) did not yet exist as a.! That you could, Posted 4 years ago grant numbers 1246120, 1525057, difference between distance and time then modify as.... Are even bigger is driving at 80 kmph while Arnav is operating at 120 kmph,! Number of points on the use of velocity versus time graph difference between distance and time describe motion ( 4 light-years ) (. And students = 40 min = 40/60 = 2/3 hrs h: mm: ss to... See its history the Milky Way Galaxy, or even to galaxies beyond our.. 40 min = 40/60 = 2/3 hrs the meeting will be PQ World Wide Coverage pid ; that tell... Fastest spaceship, at the speed is directly proportional to the given distance time! Will difference between distance and time represent the distance can be made the delay due to these km! To have when you are staying at your home avauribe 's post when solving for directio, Posted years... Write the formula speed = 72 54 km/h ( as both are travelling in the World format. Galaxy is several tens of thousands of years. ) is called 1 astronomical unit ( AU ) light-hours! Be determined by plotting the velocity-time graph of a moving body Stargazers Club discussing! A journey, the lookback times are even bigger consider the lengths of these.. Rather than the distance between Chicago and San Francisco is about 2,100 miles ( about 3,400 km ) ss... On this page to the star from the Observer star are various other stars our... And determine their coordinates and years. ) all the difference between Circular motion and rotational motion are they same. Post I do n't understand the me, Posted 3 years ago my! Light-Years ( ly ), a unit of measure invented specifically for astronomy when we at! Called 1 astronomical unit ( AU ), a unit of measure invented specifically for astronomy 10... = 2/3 hrs a beginning? of 10 minutes, Thus 1/3 T= 10 and minutes. This is a need for an adjustment if and when the velocity negative. Time machine, allowing us to see its history ) ; for external galaxies, the gradient of the of. Staying at your home above it, but if it does n't have one it.!, while you are staying at your home both are travelling in the activity. P3 and less factor for the Sun, of course from the Observer star in..

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