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NGC 7662 is a planetary nebula located in the northern constellation Andromeda.It is known as the Blue Snowball Nebula, Snowball Nebula, and Caldwell 22.This nebula was discovered October 6, 1784 by the German-born English astronomer William Herschel.
Blue Snowball: Planetary Nebula: 3.2 Andromeda: 9 C23 NGC 891: Silver Sliver Galaxy: Spiral Galaxy: 31,000 Andromeda: 10 C24 NGC 1275: Perseus A: Supergiant Elliptical Galaxy: 230,000 Perseus: 11.6 C25 NGC 2419 Globular Cluster: 275 Lynx: 10.4 C26 NGC 4244 Spiral Galaxy: 10,000 Canes Venatici: 10.2 C27 NGC 6888: Crescent Nebula: Nebula: 4.7 ...
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NGC 6572 is a planetary nebula in the constellation Ophiuchus.It was discovered in 1825 by the German astronomer Friedrich Georg Wilhelm von Struve.According to several sources such as Sky & Telescope, this object received the nicknames Blue Racquetball, Emerald Nebula, Green Nebula, and Turquoise Orb.
Lying approximately 3 degrees southwest of Iota Andromedae at a distance of about 4,000 light-years from Earth, the "Blue Snowball Nebula" [11] is a popular target for amateur astronomers. [65] It earned its popular name because it appears as a faint, round, blue-green object in a telescope, with an overall magnitude of 9.2.
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A direct distance measurement of an astronomical object is possible only for those objects that are "close enough" (within about a thousand parsecs ) to Earth.
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NGC 6231 (also known as Caldwell 76 or the Baby Scorpion Cluster [4] [5]) is an open cluster in the southern sky located half a degrees north of Zeta Scorpii.NGC 6231 is part of a swath of young, bluish stars in the constellation Scorpius known as the Scorpius OB1 association. [6]