Organics on a Comet, and Earth's Early Magnetism

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Scientists found evidence that Earth's magnetic field is more than a half-billion years older than we'd thought. As usual, that raises more questions.

The European Space Agency's Philae lander detected a "rich array" of organic compounds on Comet Churyumov-Gerasimenko 67P, including hydrogen cyanide (HCN). This is a big deal, since much of Earth's water came from comets: and HCN may have helped life begin on our world.

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