Supernova
The word supernova was coined by Walter Baade and Fritz Zwicky in 1929. The most recent directly observed supernova in the Milky Way was Kepler’s Supernova in 1604. Supernovae are a major source of elements in the interstellar medium from oxygen to rubidium. Supernova remnants might be a major sources of cosmic rays.
About Supernova in brief
A supernova is a powerful and luminous stellar explosion. It occurs during the last evolutionary stages of a massive star or when a white dwarf is triggered into runaway nuclear fusion. The peak optical luminosity of a supernova can be comparable to that of an entire galaxy before fading over several weeks or months. The word supernova was coined by Walter Baade and Fritz Zwicky in 1929. The most recent directly observed supernova in the Milky Way was Kepler’s Supernova in 1604, but the remnants of more recent supernovae have been found. Supernovae are a major source of elements in the interstellar medium from oxygen to rubidium. Supernova remnants might be a major sources of cosmic rays. They might produce gravitational waves, though thus far, gravitational waves have been detected only from the mergers of black holes and neutron stars. The earliest possible recorded supernova, known as HB9, could have been viewed and recorded by unknown Indian observers in 4500±1000 BC. SN 185 was viewed by Chinese astronomers in 185 AD. The brightest recorded super Nova was SN 1006, which occurred in 1006 AD in the constellation of Lupus, and was described by observers across China, Japan, Iraq, Egypt, and Europe. It was the second supernova to be observed in a generation. G1 9+0, occurred in the late 19th century, considerably more recently than Cassiopeia A+3, which was noted around 1680.
The first supernova of extragalactic supernova type IIb+1+0 is now more common. Observation and discovery of such supernova types are more common now, especially in a region of high extinction along the plane of the galaxy could have dimmed the event sufficiently to go unnoticed. Infrared light has been detected showing that it was a type II supernova and was not in a high extinction region. A less clear case of this is less clear, but it is likely to be the case of G1 3+0+1, which went unnoticed in the mid-19th century. It is the youngest galactic supernova that has been observed so far, and the first to be detected in the echos of high-energy light such as X-ray, infrared, and visible light. Only a tiny fraction of the 100 billion stars in a typical galaxy have the capacity to become a super Nova, restricted to either those having large mass or extraordinarily rare kinds of binary stars containing white dwarfs. The chances of observing one with the naked eye is roughly once in a lifetime, so that the chances of seeing one with a modern telescope is about 1 in 10,000 to 1 in 100,000. These supernova remnants would almost certainly be observable with modern astronomical telescopes. The last naked-eye supernova observed with modern telescopes was SN 1987A, the explosion of a blue supergiant star in the Large Magellanic Cloud, a satellite of the Milkyway galaxy.
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This page is based on the article Supernova published in Wikipedia (as of Dec. 06, 2020) and was automatically summarized using artificial intelligence.
