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In Pictures: Fabulous space photos from NASA’s Hub...
Star V838 Monocerotis's (V838 Mon) light echo, which is about six light years in diameter, is seen from the Hubble. Light from the flash is reflected by successively more distant rings in the ambient interstellar dust that already surrounded the star. V838 Mon lies about 20,000 light years away toward the constellation of Monoceros the unicorn.
In Pictures: Fabulous space photos from NASA’s Hubble telescope