Abell 63 vs Abell 82
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Abell 63
Abell 63 is a planetary nebula in the constellation Sagitta. Its central system includes the eclipsing binary star UU Sagittae, whose connection with the nebula was identified in the twentieth century. An eclipsing binary changes in observed brightness when one star passes in front of the other from Earth's viewpoint. Abell 63 is therefore studied both as an expanding ionized nebular shell and as...
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Abell 82
Abell 82 is a planetary nebula included in the catalog compiled by astronomer George Abell from astronomical survey plates. It is a faint, extended shell of gas in the constellation Cassiopeia, formed from material expelled by a dying low- or intermediate-mass star. The object is difficult to observe because its light is spread over a broad area, making it a target mainly for sufficiently sensitiv...
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