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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 ...
So a supernova with a measured redshift z = 0.5 implies the universe was 1 / 1 + 0.5 = 2 / 3 of its present size when the supernova exploded. In the case of accelerated expansion, a ¨ {\displaystyle {\ddot {a}}} is positive; therefore, a ˙ {\displaystyle {\dot {a}}} was smaller in the past than today.
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 .
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 expansion of the universe is the increase in distance between gravitationally unbound parts of the observable universe with time. [1] It is an intrinsic expansion, so it does not mean that the universe expands "into" anything or that space exists "outside" it.
— NASA Universe (@NASAUniverse) June 7, 2024. ... 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 ...
The supernova exploded when the universe was 3.5 billion years old, rather than at today's date of 13.8 billion years old. The supernova progenitor was a white dwarf star, the progenitor of all Type Ia supernovae. The gravitational lens is galaxy cluster PLCK G165.7+67.0 (at a redshift of z=0.35), which lensed the supernova and its host galaxy ...
The supernova was about 21 million light-years from Earth and is expected to have left behind either a neutron star or black hole, based on current stellar evolution models. The supernova is located near a prominent HII region, NGC 5461, in an outer spiral arm of the bright galaxy. [3] By 22 May 2023, SN 2023ixf had brightened to about ...