7 "Earth-Like" Planets Discovered: How Did NASA/ESO Do it?

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Recently in the news, 7 Earth like planets were discovered by Nasa/ESO. How did they do it? How far away from us are they? Where are they situated? These maybe among many different questions that would have raised in your mind when you heard about it.

This video describes about how Nasa was able to identify them and the information regarding their locations, sizes etc.

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