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Exoplanets are planets that orbit a star other than our Sun. The prefix ‘exo’ means ‘outside’. Astronomers have confirmed more than 4,000 exoplanets orbiting distant stars. They found first two exoplanets orbiting a pulsar in 1992.they can be hot enough to boil metal or locked in deep freeze. They can orbit their stars so tightly that a ‘year’ lasts only a ‘few days’. They can orbit orbit two suns at once and some of them are sunless rogues, wandering through the galaxy in permanent darkness.