k Bubble nebula NGC 7635 Bubble nebula NGC 7635, optical image. This nebula is named for the circular shell of gas blue at centre. This hollow shell has been excavated out of the surrounding nebula by the powerful stellar wind of a massive star within it. The entire nebula glows as the gases it contains are ionised by radiation from hot young stars that have formed within it. Different colours have been assigned to different ionised gases here sulphur is red, hydrogen is green and oxygen is blue. The nebula lies some 11,000 light years from Earth in the constellation Cassiopeia. Stock Photo - Afloimages
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Bubble nebula  NGC 7635  Bubble nebula  NGC 7635 , optical image. This nebula is named for the circular shell of gas  blue  at centre. This hollow shell has been excavated out of the surrounding nebula by the powerful stellar wind of a massive star within it. The entire nebula glows as the gases it contains are ionised by radiation from hot young stars that have formed within it. Different colours have been assigned to different ionised gases here  sulphur is red, hydrogen is green and oxygen is blue. The nebula lies some 11,000 light years from Earth in the constellation Cassiopeia.
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Bubble nebula (NGC 7635)

Bubble nebula (NGC 7635), optical image. This nebula is named for the circular shell of gas (blue) at centre. This hollow shell has been excavated out of the surrounding nebula by the powerful stellar wind of a massive star within it. The entire nebula glows as the gases it contains are ionised by radiation from hot young stars that have formed within it. Different colours have been assigned to different ionised gases here; sulphur is red, hydrogen is green and oxygen is blue. The nebula lies some 11,000 light years from Earth in the constellation Cassiopeia.

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