Scientists have so far detected at least 550 planets outside the solar system – and another 2,000-plus await confirmation. But how to pick out the ones that may be Earth-like havens for life? Here's what one team looks for in assessing any planet's potential habitability and its similarity to Earth's properties.
Pinning down the mass of exoplanets has been problematic, but it is central to determining if a planet might be habitable. Now, a new method could help scientists 'a lot.'
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