Recent questions in Speed of Light

+241 votes

0 answers

How long would it take light to reach Earth from a star that is four quadrillion miles away?

asked Aug 17, 2022 in Speed of Light by Doall

+152 votes

0 answers

What is the speed of light? Is there a direction where light travels faster than in other directions? If so, what would happen?

asked Aug 17, 2022 in Speed of Light by gazzer147

+173 votes

0 answers

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 Aug 17, 2022 in Speed of Light by Offshore

+12 votes

0 answers

Forget for the moment that it is impossible. Say we teleport (i.e. travel at infinite speed) to a planet 4 light years away, then teleport back to earth. Would we arrive just after we left, or would we have travelled 8 years into the past?

asked Aug 16, 2022 in Speed of Light by Hadders28

+16 votes

0 answers

Can dark matter only be explained at a higher speed than the speed of light?

asked Aug 15, 2022 in Speed of Light by Rich_P1508

+22 votes

0 answers

How can light have a constant speed if Einstein's theory of relativity is correct?

asked Aug 14, 2022 in Speed of Light by HEYHOLETSGO (3.0k points)

+11 votes

0 answers

Is there any medium where light cannot propagate (travel)?

asked Aug 13, 2022 in Speed of Light by SolarisTwilight

+3 votes

0 answers

If the invariant speed c were inversely proportional to the local energy density (instead of constant), it would travel faster in deep space and distances would actually be further away than currently measured. What implications does this have?

asked Aug 13, 2022 in Speed of Light by Allsorts

+19 votes

0 answers

What is the speed of light? How long does it take for a beam of light to reach us from Mars?

asked Aug 13, 2022 in Speed of Light by MrG1961

+22 votes

0 answers

What is the speed of sun rays?

asked Aug 13, 2022 in Speed of Light by paz

+18 votes

0 answers

Can we detect an object travelling away from us at two-thirds the speed of light?

asked Aug 12, 2022 in Speed of Light by Twfitz

+3 votes

0 answers

Is there proof of the speed of light?

asked Aug 12, 2022 in Speed of Light by Douglas Newman

+8 votes

0 answers

What if someone knows how to build a spacecraft that doesn't use conventional propellant and could travel light speed?

asked Aug 12, 2022 in Speed of Light by zgulick

0 votes

0 answers

Which is faster, the speed of light or how fast your eye sees an object once you open your eye?

asked Aug 12, 2022 in Speed of Light by relativedifficulty

+243 votes

0 answers

Does the speed of light decrease in media other than vacuum?

asked Aug 12, 2022 in Speed of Light by masterdiy

+154 votes

0 answers

Why do electric and magnetic fields propagate perpendicular to each other?

asked Aug 12, 2022 in Speed of Light by MowdieWark

+3 votes

0 answers

If a spaceship could travel at the speed of light, would everything else appear frozen in time from the astronauts' perspective?

asked Aug 11, 2022 in Speed of Light by RadiantCharm

+294 votes

0 answers

If one person travels at twice the speed of another person, will they cover more or less miles in the same amount of time? Why or why not?

asked Aug 11, 2022 in Speed of Light by Leigh Harper

+232 votes

0 answers

Is it possible for humans to develop technology that would allow us to travel faster than the speed of light and visit other planets?

asked Aug 10, 2022 in Speed of Light by StormyEnigma

+58 votes

0 answers

An electromagnetic wave emitted by a supernova billions of light years away, upon reaching us, loses a good part of its energy, but how is this possible if in a vacuum it does not interact with anything?

asked Aug 10, 2022 in Speed of Light by RadiantNova

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Recent questions in Speed of Light

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