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An accretion disk is a structure (often a circumstellar disk) formed by diffuse material [ a] in orbital motion around a massive central body. The central body is most frequently a star. Friction, uneven irradiance, magnetohydrodynamic effects, and other forces induce instabilities causing orbiting material in the disk to spiral inward toward ...
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.
In our own galaxy, for instance, the object called Sagittarius A* is a supermassive black hole. There are many lines of evidence for the existence of black holes in spiral galaxy centers, including the presence of active nuclei in some spiral galaxies, and dynamical measurements that find large compact central masses in galaxies such as Messier ...
A team of scientists estimates that there may be enough water, trapped in tiny cracks and pores of rock in the middle of the Martian crust, to fill oceans on the planet’s surface. The ...
In the centre of NGC 2835 lies a supermassive black hole whose mass is estimated to be 3-10 million (10 6.72±0.3) M ☉, based on the spiral arm pitch angle. NGC 2835 is the foremost galaxy in a small group of galaxies, the NGC 2835 group. Other galaxies identified as members of the cluster are ESO 497-035, and ESO 565-001.
July 26, 2024 at 6:45 PM. (Reuters) -SpaceX and NASA said on Friday they plan to launch the space agency's Crew-9 mission to the International Space Station (ISS) no earlier than Aug. 18. The ...
The Chandra X-ray Observatory ( CXO ), previously known as the Advanced X-ray Astrophysics Facility ( AXAF ), is a Flagship-class space telescope launched aboard the Space Shuttle Columbia during STS-93 by NASA on July 23, 1999. Chandra was sensitive to X-ray sources 100 times fainter than any previous X-ray telescope, enabled by the high ...
Black holes of stellar mass form when massive stars collapse at the end of their life cycle. After a black hole has formed, it can grow by absorbing mass from its surroundings. Supermassive black holes of millions of solar masses (M ☉) may form by absorbing other stars and merging with other black holes, or via direct collapse of gas clouds.