Deep-Space Photos: Hubble's Greatest Hits

The Hubble Telescopes Greatest Hits
The legendary space telescope celebrates its 20th year in orbit
NASA / JPL / Caltech / Corbis

Crab Nebula
In 1054 AD, Chinese astronomers witnessed a stellar explosion in the constellation Taurus. One thousand years later, the tattered remnants of the super dense neutron star's explosion, also known as a supernova, are still visible, sweeping up gas as they expand at a rate of 1,500 kilometers per second and rotating about 30 times per second.

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