the first discovery of a exosloar planet

The first discovery of a extrasolar planet was made in 1995 on the 6 of October by Michel Mayor and Didier Queloz when they detected a extrasolar planet in the star system 51 pegasi.This planet was called HR 8799.By 2009 over 342 extrasolar planets have been discovered.Most of the planets have a bigger mass then Jupiter but they do range from being smaller than Mercury to being bigger than Jupiter.