There are more than 3,900 confirmed planets beyond our solar system. Most of them have been detected because of their ‘transits’ — instances when a planet crosses its star, momentarily blocking its light. These dips in starlight can tell astronomers a bit about a planet’s size and its distance from its star.
But knowing more
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from Mech – Engineers Journal http://bit.ly/2sSfuev https://ift.tt/eA8V8J
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