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Sh2-157 "Lobster Claw Nebula" and neightbors (SHO-Palette starless), Martin Mutti

Sh2-157 "Lobster Claw Nebula" and neightbors (SHO-Palette starless)

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Sh2-157 "Lobster Claw Nebula" and neightbors (SHO-Palette starless), Martin Mutti

Sh2-157 "Lobster Claw Nebula" and neightbors (SHO-Palette starless)

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Description

At top NGC 7635, also known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an H II region emission nebula in the constellation Cassiopeia. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star, SAO 20575 (BD+60°2522). The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow. It was discovered in 1787 by William Herschel.
In the small nebula NGC 7538 at right lies the biggest ever discovered protostar in the milky way, 300 times bigger than our solar system.

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Sh2-157 "Lobster Claw Nebula" and neightbors (SHO-Palette starless), Martin Mutti