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Planet is the term used for a body in orbit around a star.
That Earth is one of the planets was realized later. The additional planets were discovered after the invention of the telescope. In 1994, Dr. Alexander Wolszcan, an astronomer at Pennsylvania State University, presented convincing evidence of the first known planets to exist outside our solar system. They circle a pulsar or exploded star in the constellation Virgo . In 1995, several of these extrasolar planets were discovered orbiting ordinary stars similar to our Sun as a result of observing gravitational variations of the stars.