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In 2001, Hubble observed an explosion 10 billion light-years from our planet greatly bolsters the case for the existence of a mysterious form of "dark energy" pervading the cosmos.
Credit: NASA and A. Reiss
Throughout its lifetime in orbit, some of the most spectacular images have been of mysteries from outside our solar system. The Cone Nebula is 7 light-years long and 2,500 light-years away from Earth, according to NASA.
This image, taken by the newly installed Wide Field Camera 3, shows the Butterfly Nebula (or Bug Nebula, cataloged as NGC 6302), at the center of which is a dying star that once had five times the mass of Earth's sun. Gas that was released by a dying star shoots through space at a speed in excess of 600,000 miles an hour.