What an interesting question! I know many planets have been seen
outside of our solar system, but I had never looked up much
information about it. Anyway, to answer your question, the first
planetary mass found was acutally orbiting a pulsar, and not a proper
star. It has not been considered a true planet since it does not
orbit a star.
First extra solar planetary mass orbiting a Pulsar:
There is a good history of the search for and discovery of extra solar
planets available from NASA's Jet Propulsion Laboratory:
And, for the answer: The first planet orbiting a star like our sun is
named '51 Pegasi b' or '51 Peg b' and was disovered in 1995, by
Michel Mayor and Didier Queloz at Geneva Observatory.
Details about the planet from the University of Oregons' Electronic
Search and find details about all extra solar planets at JPL's Planet
Another catalog of all planets:
Further reading about planets outside of our solar system:
And, a timeline of discoveries of extra solar planets:
I hope this answers your question, if you require further information,
please ask for a clarification before rating this question. Thank you
for using Google Answers!
planet outside solar system
first extra solar planet