The importance of supernovae

[Edit this paragraph] The concept of supernova: English supernova, also known as nova.

Theoretically, a star with a mass between 8 and 25 times that of the sun will eventually explode in a supernova. When a star runs out of all available fuel, it will suddenly lose the pressure that has been supporting its own weight, and its core will collapse into a neutron star-a lifeless ultra-dense fragment, and the outer gas blanket will be thrown out at a speed of 5%.

Astronomers call it a supernova explosion when the absolute luminosity of a star exceeds 65.438+000 billion times that of the sun, the central temperature can reach/kloc-0.000 billion degrees Celsius, and the luminosity of a nova is 65.438+000 billion times that of a nova.

When a supernova explodes, its output energy can be as high as (10) 43 Joules, which is almost equivalent to the total output energy of our sun in its main sequence star stage10 billion years. When a supernova erupts, the velocity of the ejected material can reach 10000 km/s, and the diameter of the supernova can reach the diameter of the solar system at the maximum luminosity. A supernova observed in 1970 expanded at a speed of 5000 km/s within 30 days after the explosion, reaching a maximum of three times the diameter of the solar system. Then the diameter began to shrink again.

According to the current understanding, the supernova explosion event is the "sudden death" of a massive star. For a massive star, such as a star whose mass is 8-20 times that of the sun, due to its huge mass, in the later stage of its evolution, when the core and shell are completely separated, it is often accompanied by a very large explosion. This explosion is a supernova explosion. It has been proved that 1572 and 1604 nova belong to supernovae. Hundreds of supernovae have been observed in the Milky Way and many extragalactic galaxies. However, only six supernovae have been directly observed and recorded by naked eyes in history.