1990: Supermassive Black Holes Hubble images revealed that most galaxies contain supermassive black holes millions of times heavier than the sun. Astronomers are still trying to work out the full relationship between a galaxy’s evolution and its black hole.
1991: Nascent Solar Systems Data showing pancake-shaped objects within a distant cloud of gas and dust provided the first views of protoplanetary disks — the birthplace of stars and orbiting planets, including our solar system.
1992: Dark Matter Einstein predicted that the gravity of massive bodies could alter the path of light. When Hubble observations showed this also occurring around galaxies too puny to warp light by themselves, astronomers realized that the galaxies must be suffused with an unseen kind of material — dark matter — that invisibly adds mass to the universe.
1993: Colliding Galaxies Hubble has captured images of galaxies in midcollision, with their spectacular streams of stars, gas ...
