Crab Nebula. This image combines 24 individual exposures obtained with the Hubble Space Telescopes's Wide Field Planetary Camera 2 in 1999 and 2000. Images were taken through different color filters, each revealing different elements. Blue indicates neutral oxygen, green shows singly ionized sulfur, and red comes from doubly ionized oxygen. Credit: NASA, ESA and Allison Loll / Jeff Hester (Arizona State University)
Location in the Milky Way of historic supernovas. This artist's impression shows a view looking down on the Milky Way Galaxy. The position of the Sun is shown, as are the approximate positions and names of historical supernovas, including the Crab Nebula. These are stellar explosions that are thought to have occurred in the last 2,000 years and may have been seen by early astronomers. Credit: NASA/CXC/M.Weiss
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