Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)
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The Cave Nebula - SH2-155 - Caldwell 9, Marcus Reed
The Cave Nebula - SH2-155 - Caldwell 9
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The Cave Nebula - SH2-155 - Caldwell 9

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The Cave Nebula - SH2-155 - Caldwell 9, Marcus Reed
The Cave Nebula - SH2-155 - Caldwell 9
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The Cave Nebula - SH2-155 - Caldwell 9

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Description

The Cave Nebula (Sh2-155) lies at distance of 2,400 light-years in the constellation Cepheus. It is a large star-forming cloud of molecular hydrogen spanning approximately 10 light-years. Hot class O and B blue supergiant stars to the upper right of the image are ionizing the cloud's hydrogen gas, causing it to glow at the hydrogen-alpha wavelength of 656.28 nanometers. As their intense light evaporates gas from the cloud surface, it becomes ionized and the fierce stellar winds emitted by those stars blow it back against the cloud, forming a glowing, compressed rim. This pressure also triggers formation of more stars within the cloud.

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The Cave Nebula - SH2-155 - Caldwell 9, Marcus Reed