That's how you find a planet light years away. You wait to see if a star dims. When a planet orbits a star and crosses in front of the star it dims. The amount of dimming shows the mass of the planet orbiting the star. The transition method is how scientists are looking for earth like planets now. It's fucking awesome. The new Kepler telescope out in orbit is currently mapping possible life sustaining planets in our galaxy, The Milky Way. http://www.google.com/search?q=kepl...s=org.mozilla:en-US:official&client=firefox-a I doubt there is any "significant" life close by but I don't doubt that other life exists in our galaxy. And our galaxy is one of billions of galaxies. I just blew your mind up.