Learning
to become an amateur astronomer you don't have to be an expert or know a lot of facts about the universe. You just need to be interested in learning about the universe and know some basic information that will help you to do that
One of the best tools to help in becoming an amateur astronomer is the one you are now using -- your computer. But some things about the universe can be learned more easily by getting out and looking at the sky. That's what we will focus on here.
extrasolar planet, also called exoplanet, any planetary body that is outside the solar system and that usually orbits a star other than the Sun. The first extrasolar planets were discovered in 1992. More than 700 are known, and more than 2,300 await further confirmation.
