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Forming other Earths

For an earthlike planet to form, the nebula which gave birth to its parent star must contain the "right stuff."
If life exists elsewhere in our Milky Way Galaxy, it may not be scattered evenly but confined to a specific "galactic habitable zone." Part of this idea rests on the notion that terrestrial planets can only form around stars that contain the right level of metallicity. But how do these stars get the "right stuff"? The universe's first stars were formed from the collapse of molecular clouds holding little more than hydrogen, helium, and lithium — the main elements created in the Big Bang. Wh...

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