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1997 images from Hubble showed that three different galaxies contained black holes helping scientists to theorize that nearly all galaxies contained black holes.Credit: Karl Gebhardt (University of Michigan), Tod Lauer (NOAO), and NASA
Another huge Hubble discovery was a missing link in what we knew about planet formation. Here's how NASA descibes it" "Take light and fluffy stardust, condense to rocks. It's the "condense to rocks" part scientists have been eager to see. Like making a pizza, a cloud of stardust has to go from a blob to a relatively flat disk to form a new star and planet system." Here's a piece of Orion where planets are forming.
In 2007 the Hubble detected the first-ever organic molecule in the atmosphere of a planet orbiting outside our solar system. An artist's view of planet HD 189733b.
Credit: NASA/ESA/G. Bacon (STScI)