f556c24b__04_22_2004____Background_Info__2004
[1990] Hunt for planets around other stars. No planets outside our solar system had yet been discovered. [Future] Expected to discover tens of transitory planets around stars in our Milky Way's bulge and disk. Study star and planet formation in the Orion Nebula. [2004] 
Precisely measured an extrasolar planet's atmosphere, and determined the mass of the universe's oldest known planet.
HubbleSite - NewsCenter - The Lure of the Rings (04/22/2004) - Background Info
2004