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How much water does an Earth-like planet need to harbor life? A new study has the answer

Maintaining liquid surface water is one of the preconditions that a planet has to meet in order to support life as we know it ...

Comet visible this week over Pittsburgh won't return for 170,000 years

A new comet should be visible to the naked eye this week, but you're going to need to set an alarm to see it. Comet R3 ...