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Stellar evolution is the process by which a star changes over the course of its lifetime and how it can lead to the creation of a new star. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the current age of the ...
In stellar evolution, an isochrone is a curve on the Hertzsprung-Russell diagram, representing a population of stars of the same age but with different mass. [1] The Hertzsprung-Russell diagram plots a star's luminosity against its temperature, or equivalently, its color. Stars change their positions on the HR diagram throughout their life.
The earliest known galaxies existed by about 380 Ma. Galaxies coalesce into "proto-clusters" from about 1 Ga (redshift z = 6 ) and into galaxy clusters beginning at 3 Ga ( z = 2.1 ), and into superclusters from about 5 Ga ( z = 1.2 ). See: list of galaxy groups and clusters, list of superclusters. Reionization: 200 Ma ~ 1 Ga (Exact timings ...
Unlike later generations of stars, these stars are metal-free. SN 1000+0216, oldest observed supernova, occurs. Terzan 5 forms as a small dwarf galaxy on a collision course towards the Milky Way. The dwarf galaxy carrying the Methuselah Star is consumed by the Milky Way. Formation of the star clusters NGC 6522 and Omega Centauri. 11 Ga – 9 Ga
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5th century BC – Democritus proposes that the bright band in the night sky known as the Milky Way might consist of stars. 4th century BC – Aristotle believes the Milky Way to be caused by "the ignition of the fiery exhalation of some stars which were large, numerous and close together" and that the "ignition takes place in the upper part of the atmosphere, in the region of the world which ...
However, the current rate of galaxy mergers does not explain how all galaxies move from the "blue cloud" to the "red sequence". It also does not explain how star formation ceases in galaxies. Theories of galaxy evolution must therefore be able to explain how star formation turns off in galaxies. This phenomenon is called galaxy "quenching". [16]
1977 — (May 25) The Star Wars film is released and became a worldwide phenomenon, boosting interests in stellar systems. 2012 — (May 2) First visual proof of existence of black-holes. Suvi Gezari 's team in Johns Hopkins University , using the Hawaiian telescope Pan-STARRS 1 , publish images of a supermassive black hole 2.7 million light ...