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PaleontologyThis spiky fossil shows what early mollusks looked like
The fossil, plus 17 others from more than 500 million years ago, reveal that early mollusks were slug-like creatures with prickly armor.
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AstronomyA distant quasar may be zapping all galaxies around itself
Star formation has ceased within at least 16 million light-years of the quasar. A similar phenomenon may have fried the Milky Way when it was young.
By Ken Croswell -
PaleontologyThe asteroid that may have killed the dinosaurs came from beyond Jupiter
The Chicxulub crater, left behind by the impact, contains elemental traces that suggest the origins of the notorious projectile.