Sh2-104 vs Sh2-162
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Sh2-104
Sh2-104 is a compact emission nebula and H II region located in the constellation Cygnus. It is recognized by its distinct bubble-like appearance, which is sculpted by stellar winds from its central, massive stars. Astronomers study Sh2-104 as a primary example of the collect-and-collapse model of triggered star formation. This model describes how an expanding bubble of gas compresses surrounding...
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Sh2-162
Sh2-162, formally cataloged as NGC 7635 and commonly known as the Bubble Nebula, is an emission nebula located in the constellation Cassiopeia. It was discovered by astronomer William Herschel in 1787. The nebula is an H II region shaped by the intense stellar wind radiating from the massive O-type star designated BD+60 2522. This central star's radiation ionizes the surrounding gas, causing it to...
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