In July 1994, the Hubble Space Telescope was poised to use its newly fixed optics to observe one of the most impressive astronomical events of the century - the 21 fragments of Comet Shoemaker-Levy 9 impacting Jupiter. But these observations almost didn't happen. Read more at www.nasa.gov/feature/goddard/2016/hubble-memorable-moments-comet-impact
Credit: NASA/GSFC
