It's only been 15 years that we've been able to detect planets orbiting other stars. Today we're waiting for the new tools and technology to help us find a planet that's the same size as our planet earth.
■Class discussion: Why should we care about finding a planet that's the same size as earth? So far the scientists have only found planetary giants. What if we do find a match in the next six months as the video claims? What should we do about it?
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