Fraser CainNearly 11,000 years ago, a supernova detonated relatively nearby (galactically speaking), creating the Vela Supernova Remnant. The expanding shockwaves of gas and dust cover almost 100 light-years across and would be twenty times the diameter of the full Moon if we could see it with our eyes. The 570-megapixel Dark Energy Camera (DECam) created this gigantic 1.3-gigapixel mosaic image, the largest ever released from this instrument. It's your new desktop wallpaper.
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