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Light is the fastest thing in the whole universe.

Light is the fastest thing in the whole universe.

Light travels about 300,000 km every second — fast enough to zip around the Earth more than seven times in one second.

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More facts about Space Travel

Astronauts float around inside their spaceship. Astronauts float around inside their spaceship. Rockets need lots of fuel to blast up into space. Rockets need lots of fuel to blast up into space. Space is completely silent because there is no air to carry sound. Space is completely silent because there is no air to carry sound. Astronauts wear special suits so they can breathe in space. Astronauts wear special suits so they can breathe in space. Footprints left on the Moon can stay for millions of years. Footprints left on the Moon can stay for millions of years.