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  2. Elephant trunk (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Elephant_trunk_(astronomy)

    NASA was able to produce a picture of this formation by compositing multiple images taken by the Hubble Space Telescope. It is located 7,000 light-years away, in the Eagle Nebula . [ 8 ] There are multiple elephant trunks in the formation, one of which is approximately seven light-years long.

  3. Star formation - Wikipedia

    en.wikipedia.org/wiki/Star_formation

    Westerhout 51 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]

  4. SSPSF model - Wikipedia

    en.wikipedia.org/wiki/SSPSF_model

    The SIR model (perhaps most popularly familiar in the form of Conway's Game of Life) is applied to star formation propagating through the galaxy: Each generation of stars in a neighborhood includes some massive ones whose stellar winds and, soon, supernovae, produce shock waves in the gas (Susceptible material).

  5. Stellar evolution - Wikipedia

    en.wikipedia.org/wiki/Stellar_evolution

    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 A mass-radius plot ...

  6. Initial mass function - Wikipedia

    en.wikipedia.org/wiki/Initial_mass_function

    In astronomy, the initial mass function (IMF) is an empirical function that describes the initial distribution of masses for a population of stars during star formation. [1] IMF not only describes the formation and evolution of individual stars, it also serves as an important link that describes the formation and evolution of galaxies. [1]

  7. Milky Way - Wikipedia

    en.wikipedia.org/wiki/Milky_Way

    According to recent studies, the Milky Way as well as the Andromeda Galaxy lie in what in the galaxy color–magnitude diagram is known as the "green valley", a region populated by galaxies in transition from the "blue cloud" (galaxies actively forming new stars) to the "red sequence" (galaxies that lack star formation). Star-formation activity ...

  8. Stellar structure - Wikipedia

    en.wikipedia.org/wiki/Stellar_structure

    In massive stars (greater than about 1.5 M ☉), the core temperature is above about 1.8×10 7 K, so hydrogen-to-helium fusion occurs primarily via the CNO cycle. In the CNO cycle, the energy generation rate scales as the temperature to the 15th power, whereas the rate scales as the temperature to the 4th power in the proton-proton chains. [ 2 ]

  9. Gravitational collapse - Wikipedia

    en.wikipedia.org/wiki/Gravitational_collapse

    Neutron stars are formed by the gravitational collapse of the cores of larger stars. They are the remnant of supernova types Ib , Ic , and II . Neutron stars are expected to have a skin or "atmosphere" of normal matter on the order of a millimeter thick, underneath which they are composed almost entirely of closely packed neutrons called ...

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