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An accurate determination of the distance to the Galactic Center as established from variable stars (e.g. RR Lyrae variables) or standard candles (e.g. red-clump stars) is hindered by numerous effects, which include: an ambiguous reddening law; a bias for smaller values of the distance to the Galactic Center because of a preferential sampling ...
Artist's impression of the central bulge of the Milky Way [1] In astronomy , a galactic bulge (or simply bulge ) is a tightly packed group of stars within a larger star formation . The term almost exclusively refers to the central group of stars found in most spiral galaxies (see galactic spheroid ).
Messier 94 (also known as NGC 4736, Cat's Eye Galaxy, Crocodile Eye Galaxy, or Croc's Eye Galaxy [7] [8]) is a spiral galaxy in the mid-northern constellation Canes Venatici. It was discovered by Pierre Méchain in 1781, [ 9 ] and catalogued by Charles Messier two days later.
An equatorial bulge is a difference between the equatorial and polar diameters of a planet, due to the centrifugal force exerted by the rotation about the body's axis. A rotating body tends to form an oblate spheroid rather than a sphere. Comparison between an oblate spheroid and sphere.
Further, the bulge of Sa and SBa galaxies tends to be large. In contrast, the bulges of Sc and SBc galaxies are much smaller [ 9 ] and are composed of young, blue Population I stars . Some bulges have similar properties to those of elliptical galaxies (scaled down to lower mass and luminosity); others simply appear as higher density centers of ...
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The area of sky that the Milky Way obscures is called the Zone of Avoidance. [67] The Milky Way has a relatively low surface brightness. Its visibility can be greatly reduced by background light, such as light pollution or moonlight. The sky needs to be darker than about 20.2 magnitude per square arcsecond in order for the Milky Way to be ...
Evening sky: Saturn is getting lower in the southwest and sets around 9 p.m. in early January and around 7 p.m. by the end of the month. Brilliant Jupiter is halfway up in the south at sunset and ...