When two stars line up in the night sky, the foreground star brightens the light from the background star and it acts like a magnifying glass through a telescope. This technique is used to discover planets and stars and is explained here.
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from Innovation and Digital Marketing http://www.livescience.com/56212-gravitational-microlensing-how-planets-are-found-using-the-technique-video.html?utm_source=rss&utm_medium=rss
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