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Questions tagged [time-dilation]

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Why is the onboard trip shorter when riding on a relativistic rocket as compared to a Newtonian rocket? [duplicate]

In the top answer for this question on the Space Exploration StackExchange, it's calculated that a rocket traveling at constant 1g of acceleration over 100,000 light years would, under Newtonian ...
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Hypothetical effect of Solar System/Orion Spur traveling near speed of light

I was hoping that some genius could explain what we would observe in the universe around us in the following hypothetical scenario in which the earth itself were traveling at or near the speed of ...
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What forces are experienced when someone running near the speed of light jumps?

Suppose I am running near the speed of light, say 0.87c so that my gamma factor is exactly 2. What forces will I and the ground experience if I jump? Imagine it's a normal two-footed jump where I take ...
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Is there experimental evidence that gravity affects time itself instead of time measurement?

Atomic clocks tick differently with different gravity. That's a fact. This implies either one of the following statements: (1) Gravity affects time itself OR (2) Gravity affects time measurement only ...
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A thought experiment about time dilation

Suppose you are on am infinitely long train traveling on tracks and an atmosphere that has no resistance whatsoever. No this train is traveling at fractionally below the speed of light, and you are on ...
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Special relativity different time dilatation? [duplicate]

We all know the kind of clocks being used to demonstrate the time expansion in special relativity, i took one of those and rotated it so the mirrors surfaces are orthogonal to the speed vector "$V$"......
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1answer
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Could you create a “fast forward” machine using something like an accelerating Ringworld?

If you had a large cylinder in space with people on the inside surface and you started it spinning at a constant acceleration of 1G until it was spinning at near light speed (so the tangential ...
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1answer
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Which clock will dilate when one is moving towards the other [duplicate]

Suppose two children are standing 100m apart one of them starts running towards the other with relativistic speed...which clock would be slower? Note- I thought this was similar to the twins paradox ...
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How are the time dilation and the relativistic Doppler shift added together in what observers “see”?

I'm using the illustration from this question: Suppose A and B are d light years away, and at rest. Then they symmetrically start to travel toward each other (symmetric acceleration process in ...
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2answers
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If an object is travelling near light speed, would it's actions seem to be in slow motion?

Hypothetically if we were observing a clock travelling near light speed relative to us, we would see the clock ticking at a much slower speed than us. If that is true, then would all actions that are ...
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Why isn't time contraction a thing?

I'm very naive about relativity, but if it could be possible that Alice ages less than Bob in a journey, doesn't it logically follow that from the point of view of Alice, Bob has, at some point, gone ...
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Nature of Experiment or Measurement tied to Special Relativity concepts

Premise: In special relativity, we come across concepts like Length Contraction and Time Dilation. Pertaining to these topics, I have come across the following diagram (or its slight variations) in ...
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A beginner's question on time dilation [closed]

I have just started understanding relativity so the question might look absurd. I know that the faster we move through space , the slower we move through time. But I haven't understood it fully. I ...
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Time Dilation Special Relativity

Let's say we have an observer named Jack on a spaceship traveling at a constant velocity of 0.95c to the right, according to Bill, who is on the Earth. Then the spaceship reaches planet A and then ...
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1answer
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What is the true cause of time dilation? Velocity, momentum or energy?

When learning about relativity, it is said that velocity (an object or a particle traveling close to the speed of light) results in time moving slower for the object moving. However, there is also ...
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3answers
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Time in our Universe versus time in Black Holes

The universe is immense and 13.8 Billion years has passed overall since it was formed in the Big Bang event. If time greatly slows down inside a Black Hole (BH), then logically very much less than 13....
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Due to TIME stopping, are contemporary Black Holes really just Large SHELLS of Matter and not Singularities? [duplicate]

If TIME slows down as you approach a Black Hole, has there been sufficient time in our Universe (13.8 Billion Years since the Big Bang occurred) for ANY matter inside the Event Horizon of ANY Black ...
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Voyager spacecrafts life span and theory of relativity

The Voyager spacecrafts are moving with an approximate constant speed of 16 to 17 km/s. As per Einstein's theory of relativity, time passes more slowly for them compared to us. Then, is it possible ...
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Why is light affected by time dilations in space-time curvatures

My previous question on this site gave me an answer to what affects light - space warping or time warping. The answer is- both. But what now doesn't make sense to me is why light is affected by time ...
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How slow can time get near a black hole?

The closer I get to a black hole, does time slow down proportionally? Does time stop near the event horizon?
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Is light affected by space warping or time warping?

Gravity, according to the General Theory of Relativity, is simply the curvature of space-time. Objects in the universe move through space-time in geodesic paths. Also, the most interesting part is ...
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In special relativity, what will happen to miserable Schoedinger's cat?

In special relativity would the life of the Schroedinger's cat be observerd same by two observer? Two lights emit at the same time from each end of the train heading in the right direction whose ...
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1answer
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In what sense do photons exist?

In a photon's frame of reference travel is instantaneous, so presumably a photon cannot exist in its own frame of reference. I am not aware that a "beam" of photons interacts via gravity despite ...
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Is there a temporal difference between planets due to the sun's gravitational field?

since the Sun generates a gravitational field it also generates gravitational time dilatation. Hence, time further from the Sun should pass quicker than in its proximity. Can we, therefore, say that ...
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Journey away and back at close to the speed of light $c$

If a person drives away from a clock tower at a speed close to $c$ for one whole day, and then drives back to it at the same speed (for another day), what would he see during each of the journeys? I ...
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If a photon doesn't experience time, how can it have a frequency? [duplicate]

It is said that photons, moving at c, do not experience time. But then, if a photon doesn't experience time, how can it have a frequency?
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Inertial frames with unknown past

Let's suppose two ships that cross in space at constant speed. We do not know their previous acceleration or velocity history. When they cross, they synchronize watches. From that moment, if they ...
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Light moving toward a moving observer's reference frame

The speed of light is supposed to be the same for all observers in an inertial frame, no matter the observer's speed. As a result, time slows down for observers moving quickly, and this explains why ...
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1answer
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Time dilation derived from first principles vs. “width contraction”

Wikipedia describes the usual derivation of time dilation with a moving light clock: In this and similar derivations nothing is ever said about a possible "width contraction" and why it does not ...
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Calculating Time in different reference frames

Consider the following problem. A stick passes with speed v though a breadthless person whose(the stick) proper length is L. How does: Stick See the time elapsed on my clock? I see time elapsed on my ...
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1answer
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Time dilation inside a black hole

A clock is sent towards a black hole. My understanding is that because of time dilation, the clock will appear to tick more and more slowly to an observer on Earth, to the point where the time ...
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1answer
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If time in proximity of a big mass is dilated, the energy that “escapes” the system is dilated in time as well?

Let's suppose to have a black hole and an accretion disk. The disk will produce a certain amount of visible light, but since for a far observer time is going faster does it mean that the observer will ...
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2answers
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Spacetime diagrams and their interpretation

Recently started an introductory course of relativity, and started learning about space time diagrams. I couldn’t figure out what are the uses of a spacetime diagram as an alternative to Lorentz ...
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How does time dilation affect the ability of photons to escape a black hole?

The curved space explanation of why light can't escape from a black hole is great but... I'm also wondering how time-dilation affects a subatomic particle trying to escape at the speed of light. Can ...
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When a black hole explodes due to hawking radiation, how does the curvature of space previously within the event horizon behave?

I'm thinking about the time dilation in terms of distance from the singularity, to the event horizon and outside it. After a black hole has lost its necessary mass to maintain its singularity through ...
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Bob sees Alice never reaching the event horizon. What does Alice see when looking at Bob?

Alice is in a rocket hovering outside a BH event horizon when her rocket runs out of fuel, and thus begins a free-fall decent. Bob is also in an inertial frame but at a very large distance. It is ...
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2answers
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SR time dilation discussion meaningless when there is gravity?

Let us say you have three clocks fixed to the spinning earth at the equator. If you set one of this clocks on a plane going eastwards around the globe it will have measured a lesser amount of time ...
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What creates the physical difference in ageing when travelling close to the speed of light? [duplicate]

I probably have a fundamental misunderstanding, so correct me if I'm wrong. When travelling close to the speed of light, movers experience time dilation, which is what results in the phenomenon of ...
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4answers
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Communication near a black hole

One ship is in a stable orbit outside of the event horizon of a very large black hole so that there is significant time dilation. Another ship is in its own orbit around the same black hole, but at a ...
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1answer
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Is it speed or acceleration that leads to time dilation? [duplicate]

Is it acceleration or speed that leads to time dilation or both? For example, when a spaceship accelerated to (almost) the speed of light, then reversed course to come back towards earth, does this ...
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Time dilation in a gravitational field

A friend and I were talking about relativity and we had different opinions about this situation: If I choose a frame of reference on the surface of a planet, would time "run" differently between the ...
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Query about the Michelson interferometer

Say I am cycling past a Michelson interferometer set up. Someone at rest with the experiment will see both beams travelling a distance $L_0$ and hence conclude that $T_{AB}=T_{AC}=\frac{2L_0}{c}$. ...
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Subtle problem in length contraction

Suppose a particle moves with respect to objects. Does length contraction refer to the contraction of the particle, or to the separation between objects? It seems to me it can't be both. The former ...
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Time dilation for a moving electronic clock

Is this a correct application for the time dilation theorem? Suppose an electronic clock has a copper wire of length $d$, which allows the electrons to take $t$ seconds to complete a cycle on the $d$-...
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1answer
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Question about position dependence of time dilation?

I found this picture from a physics stack exchange question on time dilation: Time dilation all messed up! I am now returning to it a few weeks later and was wondering if I am correctly interpreting ...
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What would be the time dilation standing on a neutron star in comparison to earth?

What would be the combined gravitational and velocity time dilation one would experience if they stood on the surface of a neutron star in comparison to standing on the earth's surface? Specifically, ...
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1answer
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Higgs field and Time dilation

I am wondering if the Higgs field is related to time dilation. Photons travel at the speed of light, but muons are very close but never at the speed of light. Would Muons be slowed by the interaction ...
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1answer
81 views

Question about twin paradox

I just started to learned modern physic for a two weeks, and the i got some problem to understand about the resolution of twin paradox I have attached two pages of picture above that makes me ...
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2answers
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Does time dialation cancellation occur between two observers moving in opposite directions [duplicate]

This is the question that has been on my mind lately: If an object A is moving away from an object B which is presumed stationary by A, then the time observed from the perspective of object B will ...
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1answer
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Muon decay in muons frame of reference, time muon expects us to record

I have already asked a question regarding this concept but it was flagged as a duplicate. I know this misconception is very common for special relativity but I haven't found a question that talks ...