Exoplanets are those planets that reside outside our solar system. That belong to other stars. A NASA telescope has registered(found) 1200 planets inside our Milky Way. Out of these, 54 planets reside in the Habitable Zone. This data is collected by keplers telescope in just four months of work. 200 systems are multi-planet system.
Kepler telescope located about 2000 light years from earth. When a planet orbits a star, it passes from front side of star and then back side of star. When planet passes from front of star, light of star dims slightly. Brightness of star increases when planet is at backside of star. By measuring the difference between the brightness, we can know the presence of planet around a star. Kepler is sampling 156,000 stars like the sun. It take a long time to get the full data about a planet. Because, complete information is available only after 1 or 2 revolutions around the star. Earth like planets take 365 days for one revolution. Therefore Kepler telescope continue the examine the planets for more data. Kepler has only studied the 1/400th of the sky. It also take more time to measure planets away from stars. From all this info, we can say life ought to be very common in the universe.
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