The most distant galaxies in this deep field image from the James Webb Space Telescope appear as small, faint dots—and are receding from us faster than the speed of light due to cosmic expansion. If ...

Physics says nothing can travel faster than light through space, and that rule still holds. However, scientists have ...

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The light echo around the star V838 Monocerotis as seen by the Hubble Space Telescope in November 2005. When I was a teenager, I was—shockingly, I know—deeply nerdy. At a science-fiction convention, I ...

For much of the twentieth century, scientists expected the expanding universe to slow over time. The opposite turned out to be true. Space is stretching faster today than in the past, and the precise ...

When people picture the universe, they imagine everything still out there, sitting in space waiting to be discovered. The truth is far stranger. Most of the universe has already slipped out of view ...

Since Einstein, physicists have found that certain entities can reach superluminal (that means "faster-than-light") speeds and still follow the cosmic rules laid down by special relativity.

If there is an absolute law in the universe, it’s that nothing can travel faster than the speed of light. For science-fiction enthusiasts, that’s a bit depressing. Space is big, and while the speed of ...