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Sagittarius A (Sgr A) is a complex radio source at the center of the Milky Way, which contains a supermassive black hole. It is located between Scorpius and Sagittarius , and is hidden from view at optical wavelengths by large clouds of cosmic dust in the spiral arms of the Milky Way.
Sagittarius is one of the constellations of the zodiac and is located in the Southern celestial hemisphere. It is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy and remains one of the 88 modern constellations. Its old astronomical symbol is (♐︎). Its name is Latin for "archer".
Chi 1 Sagittarii (χ 1 Sagittarii) is a binary star [6] system in the zodiac constellation of Sagittarius. The pair have a combined apparent visual magnitude of +5.03, [2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 12.95 mas as seen from Earth, [1] it is located around 252 light years from the Sun.
Sagittarius A*, abbreviated as Sgr A* (/ ˈ s æ dʒ ˈ eɪ s t ɑːr / SADGE-AY-star [3]), is the supermassive black hole [4] [5] [6] at the Galactic Center of the Milky Way.Viewed from Earth, it is located near the border of the constellations Sagittarius and Scorpius, about 5.6° south of the ecliptic, [7] visually close to the Butterfly Cluster (M6) and Lambda Scorpii.
υ Sgr is a binary system with an orbital period of 137.939 days and is approximately 1,800 light years from Earth. The primary star dominates the visible radiation and spectrum, but the secondary is hotter and more massive. Some sources consider the "invisible" component to be the primary on the basis of its mass. [8]
The planets, the Moon, and the Sun also revolve around the Earth in the vast space between its surface and the edge of the firmament. [25] Because the Earth is in the center of the universe, it is equidistant from the firmament and is thus not compelled to "fall" in any specific direction. [ 26 ]
Money-wise, Sagittarius gets some very good news this year as Pluto—planet of life and death—moves out of their financial zone for the first time since 2008!
Fraser Cain called the book depressing on Universe Today, but said that the authors "tell an engaging story" and that the scientific terminology used is well explained. [2] Publishers Weekly said that the authors do not make an airtight case, though "they do deftly bring together findings from many disparate areas of science in a book that ...