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Most normal matter in the universe isn't found in planets, stars or galaxies – an astronomer explains where it's distributed
But the Big Bang theory predicts that about 5% of the universe's contents should be atoms made of protons, neutrons and ...
A special handful of asteroids that spacecraft have never visited seem to be massive hunks of metal, the nuggets of would-be planets that have lost their rocky outer layers. But scientists can't find ...
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