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Representative lifetimes of stars as a function of their masses The change in size with time of a Sun-like star Artist's depiction of the life cycle of a Sun-like star, starting as a main-sequence star at lower left then expanding through the subgiant and giant phases, until its outer envelope is expelled to form a planetary nebula at upper right Chart of stellar evolution
NGC 6334, colloquially known as the Cat's Paw Nebula, or Gum 64, is an emission nebula and star-forming region located in the constellation Scorpius. [4] NGC 6334 was discovered by astronomer John Herschel in 1837, who observed it from the Cape of Good Hope in South Africa . [ 5 ]
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The W51 nebula in Aquila - one of the largest star factories in the Milky Way (August 25, 2020). Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse and form stars. [1]
Formation of the earliest Population I stars and planetary nebulae, followed by rocky terrestrial planets, moons, asteroids and icy comets. Formation of the exoplanets 55 Cancri B, Kepler 11 c and 51 Pegasi b. A galaxy collides with the Milky Way, giving rise to the so-called Gaia Sausage population of stars. Formation of Gliese 876 and its ...
The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red-giant branch in stars whose masses are similar to the Sun's. Horizontal-branch stars are powered by helium fusion in the core (via the triple-alpha process) and by hydrogen fusion (via the CNO cycle) in a shell surrounding the core.
This will cause the outer layers of the star to expand greatly, and the star will enter a phase of its life in which it is called a red giant. [ 121 ] [ 122 ] Within 7.5 billion years, the Sun will have expanded to a radius of 1.2 AU (180 × 10 ^ 6 km; 110 × 10 ^ 6 mi)—256 times its current size.
η Carinae (Eta Carinae, abbreviated to η Car), formerly known as η Argus, is a stellar system containing at least two stars with a combined luminosity greater than five million times that of the Sun, located around 7,500 light-years (2,300 parsecs) distant in the constellation Carina.