SUMMARY: When the second brightest supernova seen in modern times, SN 1993J, blew up several years ago, it did leave a survivor. Using the Hubble Space Telescope, and several ground-based observatories, an international team of astronomers discovered a massive companion star that must have been orbiting the supernova at the time it exploded. This discovery is very important because it will allow astronomers watch what the remnant of SN 1993J does to its companion star. They might even be able to detect a neutron star or black hole forming in real time.

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