Recent questions in Relativity physics

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Can you have zero speed and still be travelling?

asked Feb 12, 2023 in Relativity physics by StellarEnigma (2.3k points)

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Have we seen any galaxies "wink out" as they recede beyond the light speed barrier to observation?

asked Feb 11, 2023 in Relativity physics by Crucken

+3 votes

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How is the speed of light achievable scientifically?

asked Feb 11, 2023 in Relativity physics by Old Time spark

+204 votes

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How much speed is in 1500rpm?

asked Feb 10, 2023 in Relativity physics by maja883

+10 votes

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How do we know the speed of light is not additive to its source, e.g. if I'm moving 10'/s North and shine my laser North it's not 10'/s + c? Michelson-Morley only shows there's no special frame in which it's constant.

asked Feb 10, 2023 in Relativity physics by JimDIY

+15 votes

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Can we say that light is a stream of particles?

asked Feb 10, 2023 in Relativity physics by BlazeCharm

+9 votes

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What do physicists mean when they say that time is relative to the observer?

asked Jan 20, 2023 in Relativity physics by Glennuk

+90 votes

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How would special relativity need to be modified to take into account a fourth spatial dimension?

asked Jan 20, 2023 in Relativity physics by Charles Arnold

+22 votes

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What's the fundamental reason why the speed of light cannot be broken? Why does the universe want to preserve the upper barrier on speed of light so much so that it readily slows down time rather than see the speed barrier broken?

asked Jan 20, 2023 in Relativity physics by P4rky

+120 votes

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What will happen if two cars with identical mass collide with each other while traveling at exactly the same speed?

asked Jan 19, 2023 in Relativity physics by AstralWhisper

+313 votes

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Does gravity have a range? As the expansion of space moves other galaxies further away from us, at ever increasing speed until their “speed” relative to us becomes greater than that of light, will their gravity then be absolutely zero to us?

asked Jan 17, 2023 in Relativity physics by MysticDreamer

+16 votes

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Did Galileo Galilei come up with the idea behind special relativity?

asked Jan 17, 2023 in Relativity physics by Karo

+102 votes

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If someone could travel faster than the speed of light, would they be able to see their own past just like traveling backwards through time on Earth?

asked Jan 15, 2023 in Relativity physics by Peter Trinh

+104 votes

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What happens to light when you shine a flashlight in space? Does it continue traveling forever or does it stop eventually?

asked Jan 14, 2023 in Relativity physics by VelvetEnigma

+6 votes

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If we know that light travels more slowly through fog than through a clear environment, how can we claim that a planet in another solar system is so many light years away?

asked Jan 13, 2023 in Relativity physics by SeraphicVerse

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What happens when you multiply the speed of light by itself in Einstein's equation E=mc²?

asked Jan 13, 2023 in Relativity physics by roastedparmesan

+8 votes

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What happens when light travels slower than its original velocity and how much slower can it be before we notice a change in brightness?

asked Jan 11, 2023 in Relativity physics by limestone cowboy

+9 votes

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Why is our universe built so that the speed of light is 299,792,458 m/s, and not some other number?

asked Jan 11, 2023 in Relativity physics by Not Too Sure

+275 votes

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Does length contraction apply to the spaceships and rope in Bells paradox? Does the string break and explain why, e.g., with a spacetime diagram from the POV of the spaceship?

asked Jan 10, 2023 in Relativity physics by robgul

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If time dilation makes clocks tick slower in gravity or through motion, shouldn’t this also change the overall frequency (i.e., deeper voices)?

asked Nov 20, 2022 in Relativity physics by unwoken

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Recent questions in Relativity physics

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