Imagine a big, dark sky with shiny stars and planets where astronauts go on adventures.
In: Planetary Science
Space is mostly nothing. Void, vacuum. It’s by far mostly made up of absolutely nothing, not even air.
There are occasional planets, stars, asteroids and odd particles here and there in space. Most of them formed an extremely long time ago.
We have a decent enough idea of what’s in space, but we’ve never gone physically further than our own moon. That’s because everything in space is *extremely* far away.
If you started walking east in a straight line at the equator, you’d have to walk 25,000 miles to get back to where you were and loop around the entire Earth. The moon is 240,000 miles away, or nearly 10x that. It takes a space craft about three days to get there.
Our nearest neighbouring planet, Mars, is 140,000,000 miles away. We’ve never visited.
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