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Try failed stars for alien life

The search for alien life usually focuses on planets around other stars. But a lesser-known possibility is that life has sprung up on planets that somehow were ejected from their original solar systems and became free-floating ...

dateMar 31, 2011 in Astronomy
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Snowball Earth hypothesis challenged

The hypothesis that the Earth was completely covered in ice 635 million years ago has received a serious blow. The atmospheric concentration of CO2 during that period was much lower than previously thought, according to a ...

dateOct 12, 2011 in Earth Sciences
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