Enlarge / Hubble Space Telescope mosaic image of the Crab Nebula, a six-light-year-wide expanding remnant associated with a star’s supernova explosion in 1054 CE (credit: NASA/ESA/J. Hester & A. Loll (Arizona State University) In August 1181, astronomers within China and Japan witnessed a bright “guest star” in the night sky that we now know to […]
