The long straight feature-just one light year in length-is the Pencil Nebula. It was identified by John Herschel (son of William who discoverd Uranus) in the 1480s. The Nebula is a shockwave ,moving from right to left across this Hubble image.Here,expanding gases from explosion have encounterd a dense reigon of material in space. The gases,colour-coded red (hydrogen) and blue (oxegen),may eventully compress their surroundings to trigger star formation.
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