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Questions tagged [time-dilation]

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How do we explain this new take on the old Twins Paradox?

Here's a new take on the age old Twins Paradox that I have not been able to figure out. We have two twins in two separate space ships at the same place and time. Twin A fires his thrusters for 1 year ...
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2answers
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Is this textbook's solution to a time-dilation question correct? [on hold]

Please check if this solution is correct or not. If not then what will be it's right solution? According to me the the solution is wrong and the question is ambiguous. the wrong solution is the ...
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2answers
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Gravitational time dilation and a race [on hold]

If there is a person far away from a gravitational source(higher gravitational potential) the faster time passes relative to a person closer to that gravitational field. Is this correct?(this is how I ...
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1answer
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How does gravitational time dilation affect how we age?

Suppose you could live on Jupiter without dying from anything except age, how much longer would you be able to live there compared to how long you could live on Earth?
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1answer
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Time dilation explained using a light-pulse clock [duplicate]

I found an explanation of time dilation using a light-pulse clock in the book 'Concepts of modern physics' by Arthur Beiser: In this explanation, the clock is moving in a direction perpendicular to ...
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0answers
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Traveling almost speed of light [duplicate]

I am in a huge rocket which is big as the moon. I will accelerate to 99% of the speed of light in 1 nanosecond, so I will travel 300 000 km distance. Then immediately turn 180 degrees and came back to ...
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3answers
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Thinking about Time Dilation [on hold]

Shouldn't the observer on the Earth find the clock on the rocket to show less time due to time dilation and similarly in the opposite case the observer on rocket will find the clock on earth to show ...
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2answers
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Trading clocks in two different reference frames

I'm a high school student, just learned relativity. I understand that observed time is different between two different inertial reference frames. I vaguely understand that time is different in two ...
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3answers
112 views

Time dilation when observed from each frame [duplicate]

I have just begun with special relativity so pardon me if my question seems too obvious. In the books I am following, there is an example of time dilation which says: The half life of muons is $\...
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1answer
66 views

Gravitational Time dilation for motion in a gravitational field [duplicate]

An astronaut is travelling towards a black hole in a space ship traveling at 0.8 C. The guy’s position is not fixed relative to the black hole. He is travelling towards it from a distance. How to ...
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1answer
84 views

Where does ones relativity begin/end? [duplicate]

If there were a space ship moving close to the speed of light, that was large enough for a smaller ship inside of it to reach close to the speed of light and it opened its hanger doors and the smaller ...
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1answer
80 views

Measuring time dilation of SR by a mechanical clock

I think this is a very basic question, but relativity is always not intuitive to me. When we say that time goes slow when moving (viewed by another inertial coordinate system), we just assume that ...
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1answer
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Can a system's orientation relative to direction of motion create additional relativistic effects?

Setup Consider an observer, at rest, holding two perfect clocks: The first perfect clock is ordinary--with no additional distinction. The second perfect clock has a special constraint, as it is ...
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1answer
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How do I calculate time dilation on GPS satelites due to Earth's mass?

I found this answer which gives as the formula $$T_2 = \frac{T_0}{\sqrt{1-\frac{2GM}{c^2 R}}}$$ that should result in the time $T_2$ passed on a GPS satellite while $T_0$ seconds pass in the center ...
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1answer
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What if looked inside a moving spaceship, from Earth?

So we all know about time dilation, and how Alice travelling in a spaceship relative relative to Bob ages more slowly than him. When Alice gets back to Earth, she has biologically aged time $t$, ...
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Would you reach a singularity before evaporation of the black hole? [duplicate]

When going to a physics camp the other day, we discussed the Schwarzchild-metric for a rotational symmetric non-spinning black hole and its famous time-dilation properties. However, we know that ...
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2answers
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When a clock was flown around the world,was time dilation mutual?

Time dilation is always mutual - both clocks are travelling relative to each other and both must observe that the other clock is slower than themselves. Since motion is relative, and it is not ...
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1answer
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How can we have different speeds relative to a same point for a same object?

A day last not the same at all altitudes (https://aapt.scitation.org/doi/10.1119/1.5000802), meaning earth has different angular velocities. What is the actual rotation speed of the earth to the ...
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92 views

Yet another question about time dilation

I thought I had understood special relativity, at least the idea of the clocks with light pulses and rods from the book The Meaning of Relativity. But going through the basic illustration of the time ...
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1answer
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Does an object falling into a black hole appear to become flat for an outside observer?

In special relativity when an object moves close to the speed of light it will appear redshifted due to time dilation. In addition the object will also appear to be length contracted. But what about ...
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0answers
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Shapiro time delay for signal with velocity $v<c$? (updated)

Consider appendix A in this paper. Here a situation is considered where a particle is moving along the red $z$-direction, while experiencing the symmetric gravitational potential of two massive ...
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0answers
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Kip Thorne's time traveling wormhole and conservation of energy

Using this article as a basis: https://www.space.com/28000-physicist-kip-thorne-wildest-theories.html So you build a wormhole, put one end in your backyard (for convenience your backyard is on an ...
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2answers
36 views

How can I calculate time dilation between our clock, and clock in satellite? [duplicate]

We know satellite is moving , so there should be time dilation due to motion, also we know due to Earth's Gravitational field there should be time dilation, what should I do, just calculate both of ...
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Wormholes and Time Machines

According this paper: Morris, Michael S. and Thorne, Kip S. and Yurtsever, Ulvi (1988) Wormholes, time machines, and the weak energy condition. Physical Review Letters, 61 (13). pp. 1446-1449. ...
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3answers
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Time Dilation Equations and Varying Interpretations

I have been seeing problems involving time dilation but the interpretation used by some people is not always the same. $$ \tag{1} \Delta t' = \gamma \Delta t $$ If we think about the twin B going ...
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Can someone explain how photons does not experience time and distance [duplicate]

Google search: Does light experience time? A: "Well, not for light. In fact, photons don't experience any time at all. ... From the perspective of a photon, there is no such thing as time. It's ...
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A little help on Gravitational time dilation

Could somebody explain Gravitational time dilation in layman's term for me please!? And in the formula of Definition, it mentioned a capital H, but it didn't ...
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2answers
99 views

Time dilation for opposite sides of the planet

If time passage depends upon the speed of the movement trough space, does the time pass differently on the opposite sides of the planet since Earth is rotating and orbiting the Sun at the same time ...
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2answers
179 views

What's inside a frozen star?

Consider a specific black hole whose whole mass is located at the event horizon. How such a black hole can form is beyond he scope of this question. Perhaps a spherical shell made of the neutron star ...
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0answers
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Formulaic representation of time differential

It is a known fact that time passes at a different rate on earth than it does elsewhere in the universe. Where a second on earth passes uniformly, at an altitude of 11000 or also passes uniformly but ...
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1answer
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How much energy needed to cross the galaxy in time $t$?

Sorry if this is a dumb question. A friend of mine just asserted that it's possible to get anywhere in the universe in less than 30 seconds of your time due to time dilation. I do imagine that'll ...
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2answers
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Photon time dilation paradox

When traveling at the speed of light (v=c), left under the radical you would have 0. This answer would be undefined or infinity if you will (let's go with infinity). The reference time (T0) divided by ...
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3answers
66 views

Time dilation moving with the speed of light

I'm having some issues with special relativity. I must misunderstand something but i'm not sure what. I would very much appreciate your help. We can see from time dilation, if you are traveling with ...
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1answer
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SR Time Dilation in Rigid Structure Clocks

Special relativity says that all clocks will show same time dilation, irrespective of clock mechanism. But Time period, T, of a clock is a formula that must continue to hold even if time dilates. Let ...
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2answers
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How is time affected by the bending of space-time?

By Newton's Laws, we can calculate the effect of gravity, but he didn't give the actual reason for gravity. I searched the internet for it, but all the answers have this "bending of space-time" stuff. ...
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1answer
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Explanation of time dilation derivation [duplicate]

One way time dilation is derived is as follows. A light source inside a train sends photons vertically to a mirror on the ceiling of the train. Observer A is inside the train and observer B is outside....
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3answers
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Why does time dilation require events to occur at same point in space?

I was reading through "University Physics with Modern Physics ~ Sears and Zemansky" and they mentioned the following paragraph in time dilation : We may generalize this important result. In a ...
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Derivation of Lorentz Contraction WITHOUT light roundtrip

A typical Lorentz Contraction proof relies on the axiom that "the speed of light is constant" and goes as follows. Given: Frame $F_1$ moves at speed $v$ relative to frame $F_0$. In frame $F_1$ sit 2 ...
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2answers
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Mistake in simple calculation in special relativity [closed]

I am just learning a little bit of special relativity on my own and am obviously still quite confused. I would appreciate it if someone could point out the error in the following calculation: Let A ...
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Would time dilation affect temperature?

This answer on Astronomy.SE got me thinking about temperature, and our definition of it. The answer is to a question about why the temperature of a black hole is so cold when it absorbs so much energy,...
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1answer
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Does one age quicker at higher altitudes?

See title: Does one age quicker at higher altitudes? A few years ago I heard that you would age slightly faster (or slower) at higher altitudes. Is this true? What is the theory or evidence for ...
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1answer
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Time dilation near a black hole

If an Object exists near a black hole where 1 hour of its time is observed by a distant observer as 10 hours, then is total amount of light emitted by Object (in that one hour) toward the distant ...
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2answers
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How does emitting light while moving not break the law of conservation of energy?

Say you have 2 identical LED monochromatic flashlights. The battery lasts exactly 1 hour. We are able to calculate the energy emitted as photons from the LED by Planck's Law: $E = h\nu$. Now if we ...
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1answer
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What would I see if I watched alien TV through a telescope?

Let's say I created a telescope so powerful that I could even see and perfectly track a television screen on a planet that orbits a distant star. Also assume that this star is moving at a high ...
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1answer
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Time Elapsed for a moving observer to reach a reflected pulse of light

Alice is moving towards a mirror with a velocity of $0.8c$. She sends a pulse of light toward the mirror when she is at a distance $L$ from the mirror and she times how long the pulse of light takes ...
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0answers
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If two observers have a velocity difference relative each other, do they both record the other one's clock as being slow? [duplicate]

If velocity slows time down, what about relative velocity; do two people measure each other's clocks to run slow?
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3answers
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What is the difference between relative time dilation and absolute time dilation

I know special relativity says that traveling at high speeds (or really any speed) causes time dilation; and General relativity says that gravity also causes time dilation. I was wondering if relative ...
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7answers
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Why does gravity cause time dilation?

I know there have been several posts asking the same or similar questions, but I haven't been able to grasp this from reading any existing questions. My question is: why does gravity cause time ...
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How does LIGO detect Gravitational Waves if they bend both space and time?

Please note that this is not an inquiry into the mechanisms of technology that LIGO uses to detect gravitational waves. Also, I am not a flat-earther. I was watching physicists vs. flat-earthers ...
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Is there any gravitational time dilation for an observer at the Earth's centre of gravity? [duplicate]

The Equivalence principle lets me suppose that 'if there is no gravitational acceleration' there is no difference in ticking rate between the clock of a very distant observer and the clock of an ...