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Calcium-rich supernovae are a rare type of very fast supernova with unusually strong calcium lines in their spectra. [69] [70] Models suggest they occur when material is accreted from a helium-rich companion rather than a hydrogen-rich star. Because of helium lines in their spectra, they can resemble type Ib supernovae, but are thought to have ...
For example, a 2019 paper analyzed the Joint Light-curve Analysis catalog of Type Ia supernovas, containing ten times as many supernova as were used in the 1998 analyses, and concluded that there was little evidence for a "monopole", that is, for an isotropic acceleration in all directions. [17] [18] See also the section on Alternate theories ...
But while supernovas occur only once, a nova can happen again and again. After a nova explosion, the dwarf star remains intact and the cycle triggering another explosion starts over, which NASA ...
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.
The electromagnetic energy released by these events varies from comparable to other type Ic supernova, to some of the most luminous supernovae known such as SN 1999as. [ 13 ] [ 14 ] The archetypal hypernova, SN 1998bw, was associated with GRB 980425 .
A nova, a rare astronomical event, could be visible soon. It won't last long, and it won't occur again for several decades. How to see it in 2024.
A Type II supernova or SNII [1] (plural: supernovae) results from the rapid collapse and violent explosion of a massive star. A star must have at least eight times, but no more than 40 to 50 times, the mass of the Sun ( M ☉ ) to undergo this type of explosion. [ 2 ]
In this case, the event is usually classified as a Type Ia supernova. Novae most often occur in the sky along the path of the Milky Way, especially near the observed Galactic Center in Sagittarius; however, they can appear anywhere in the sky. They occur far more frequently than galactic supernovae, averaging about ten per year in the Milky Way.