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Cygnus A (3C 405) is a radio galaxy, one of the strongest radio sources in the sky. A concentrated radio source in Cygnus was discovered by Grote Reber in 1939. In 1946 Stanley Hey and his colleague James Phillips identified that the source scintillated rapidly, and must therefore be a compact object. [4]
Many galaxies are strong radio emitters, ... were seen in 90 hours of additional observations implies that it was a singular event such as a supernova or ...
SN 1054 remnant (Crab Nebula)A supernova is an event in which a star destroys itself in an explosion which can briefly become as luminous as an entire galaxy.This list of supernovae of historical significance includes events that were observed prior to the development of photography, and individual events that have been the subject of a scientific paper that contributed to supernova theory.
Cassiopeia A (Cas A) (listen ⓘ) is a supernova remnant (SNR) in the constellation Cassiopeia and the brightest extrasolar radio source in the sky at frequencies above 1 GHz. The supernova occurred approximately 11,000 light-years (3.4 kpc ) away within the Milky Way ; [ 2 ] [ 3 ] given the width of the Orion Arm , it lies in the next-nearest ...
The known history of supernova observation goes back to 1006 AD. All earlier proposals for supernova observations are speculations with many alternatives. Since the development of the telescope, the field of supernova discovery has expanded to other galaxies. These occurrences provide important information on the distances of galaxies.
Mysterious blasts of intense energy, known as fast radio bursts, are coming from massive galaxies, scientists have said. Fast radio bursts were first found in 2017, when scientists spotted that ...
The SIMBAD database lists NGC 2927 as a radio galaxy, i.e. it has giant regions of radio emission extending well beyond its visible structure. [4] One supernova has been observed in NGC 2927: SN 2023uvg (type Ic, mag. 18.7389) was discovered by the Automatic Learning for the Rapid Classification of Events (ALeRCE) on 13 October 2023. [5]
Described in February 2022, the fast radio burst was found within a cluster of stars, called a globular cluster, on the outskirts of galaxy Messier 81, located 12 million light-years from Earth.