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NGC 5643 has an active galactic nucleus and is a type II Seyfert galaxy. ... [18] [19] It increased in magnitude from 15.8 to 14.8 within the next day. [20]
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With an apparent visual magnitude of 8.61, [3] it is too faint to be visible without a telescope. Based on parallax measurements, this system is located at a distance of approximately 9.6 kilolight-years (2.9 kiloparsecs ) from the Sun. [ 2 ] At present it is moving closer to the Earth with a radial velocity of −33 km/s.
The polar ring has a diameter of 450 pc and in it is embedded one with a diameter of 220 pc visible in H 2 1-0 imaging. The estimated cold molecular gas mass within the polar ring is estimated to be 10 8 M ☉. The ring can provide enough material for an active galactic nucleus and for circumnuclear star formation. [4]
The Sloan Great Wall is between 1.8–2.7 times longer than the CfA2 Great Wall of galaxies (discovered by Margaret Geller and John Huchra of Harvard University in 1989). [2] It also contains several galactic superclusters, the largest and richest of which is named SCl 126. This is located in the highest density region of the structure.
Galactic 01, previously referred to as Unity 23, was a sub-orbital spaceflight of the SpaceShipTwo-class VSS Unity which launched on 29 June 2023. [1] The launch was the first commercial spaceflight for Virgin Galactic . [ 2 ]
Charles Grahmann was born in Hallettsville, Texas, on July 15, 1931. [1] He was the fourth of 11 children born to Annie Grafe Grahmann and Nicholas Anthony Grahmann. The family worked a small farm with horse or mule-driven implements. Grahmann attended Sacred Heart School in Hallettsville from 1938 to 1945.
Gamma ray and optical (visible light) light curves for the pulsar, adapted from Spolon et al. (2019) [3]. Vela is the brightest pulsar (at radio frequencies) in the sky and spins 11 times per second [4] (i.e. a period of 89.33 milliseconds—the shortest known at the time of its discovery) and the remnant from the supernova explosion is estimated to be travelling outwards at 1,200 km/s (750 mi ...