#speed-of-light

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Science
fromBig Think
2 hours ago

Light and gravity travel at the same speed, but don't arrive together

Gravitational waves and light travel at identical speeds; the observed two-second arrival difference arises from emission-timing and source-process differences, not faster propagation.
Science
fromBig Think
3 days ago

How the "meter" came to be exactly one meter long

Length standards evolved from body-based units to pendulums, bars, atomic wavelengths, and today the meter equals light travel in 1/299,792,458 second.
Science
fromwww.scientificamerican.com
1 month ago

Warp Speed! How Some Galaxies Can Move Away from Us Faster Than Light

Nothing can move faster than light through space, but cosmic expansion can make distant galaxies recede from us faster than light.
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fromwww.scientificamerican.com
2 months ago

How to See Faster-Than-Light Motion

The joke is that the speed of light really is a cosmic law; to the best of our understanding, nothing can travel faster than light. Generations of Star Trek notwithstanding, this restriction isn't just some engineering limit, like the way the speed of sound used to be unsurpassable for airplanes (the phrase sound barrier was popular in sci-fi movies when I was a kid). The speed of light is the ultimate physical speed limit, a parameter woven into the fabric of the universe itself.
Science
fromBig Think
2 months ago

Does the Universe expand faster than the speed of light?

Nothing can exceed the ultimate speed limit set by the laws of physics, known as the speed of light in a vacuum, or 299,792,458 m/s.
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