Most normal matter in the universe isn't found in planets, stars or galaxies – an astronomer explains where it's distributed
While space is often referred to as a vacuum, it isn't completely empty....
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While space is often referred to as a vacuum, it isn't completely empty....
"I think every astronomer is going to find something of value here, as NASA's missions enable the world to answer fundamental questions about how the universe got its start, and how it changed to even...
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