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Neutrinos travel so close to the speed of light we were unsure for awhile whether or not they had a rest mass.

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16y ago

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What travels at 300000 kilometers per second in a vacuum?

The closest is the speed of light at 299,792,458 kilometers per second.


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Light travels slower through a medium. Generaly the dencer the medium the slower light travels. Light travels fastest through a vacuum assuming its speed is not being affected by gravity which also affects the speed of light. Examples. A very very thick piece of glass will appear thinner than it actually is and a streight stick will appear to bend if put into water at an angle.


The sound travels at the speed of light to your ear?

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What light travels the fastest red or yellow?

they both travel at the same speed ? :>)