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| Multiwavelength X-ray, infrared, and optical compilation image of Kepler's supernova remnant, SN 1604 |
It was a supernova that occurred in the Milky Way, in the constellation Ophiuchus. It is the most recent supernova to have been unquestionably observed in our own galaxy, occurring no farther than 6 kiloparsecs or about 20,000 light-years from Earth. Visible to the naked eye, it was brighter at its peak than any other star in the night sky, and all the planets (other than Venus), with apparent magnitude −2.5. It was visible during the day for over three weeks.
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