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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 ...
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 ...
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 ...
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: Formation of the Gliese 581 planetary system, BX442 (oldest grand design spiral galaxy observed), globular cluster NGC 2808, red giant star Mu Cephei, and the Andromeda Galaxy.
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 ...
1781 – Charles Messier and his assistant Pierre Méchain publish the first catalogue of 110 nebulae and star clusters, the most prominent deep-sky objects that can easily be observed from Earth's Northern Hemisphere, in order not to be confused with ordinary Solar System's comets. [122] 1787 – Herschel discovers Uranus's moons Titania and ...
Using the Hubble Space Telescope researchers have conducted a pioneering 3-year study of the massive dense young star cluster Westerlund 2. In the process, discovering that dense clouds of ...
The timeline of the early universe outlines the formation and subsequent evolution of the Universe from the Big Bang (13.799 ± 0.021 billion years ago) [1] to the present day. An epoch is a moment in time from which nature or situations change to such a degree that it marks the beginning of a new era or age .