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The evolving star may eject some portion of its atmosphere to form a nebula, either steadily to form a planetary nebula or in a supernova explosion that leaves a remnant. Depending on the initial mass of the star and the presence or absence of a companion, a star may spend the last part of its life as a compact object ; either a white dwarf ...
Comet Lovejoy and Jupiter, a giant gas planet; The Sun; Sirius A with Sirius B, a white dwarf; the Crab Nebula, a remnant supernova; A black hole (artist concept); Vela Pulsar, a rotating neutron star; M80, a globular cluster, and the Pleiades, an open star cluster; The Whirlpool galaxy and Abell 2744, a galaxy cluster; Superclusters, galactic ...
[5] [6] [7] As the density further increases, the remaining electrons react with the protons to form more neutrons. The collapse continues until (at higher density) the neutrons become degenerate. A new equilibrium is possible after the star shrinks by three orders of magnitude, to a radius between 10 and 20 km. This is a neutron star.
A type of naturally occurring physical entity, association, or structure that exists within the observable universe but is a more complex, less cohesively bound structure than an astronomical body, consisting perhaps of multiple bodies or even other objects with substructures, such as a planetary system, star cluster, nebula, or galaxy. Though ...
At the same time, gravity will attempt to contract the system even further, and will do so on a free-fall time = / /, where is the universal gravitational constant, is the gas density within the region, and = / is the gas number density for mean mass per particle (μ = 3.9 × 10 −24 g is appropriate for molecular hydrogen with 20% helium by ...
"The unusual object, called CX330, was first detected as a source of X-ray light in 2009," according to a NASA news press release. It's closest neighboring star formation is over a thousand light ...
A final state for a star in the far future (10 1500 years) of the universe, when all matter is transmuted to iron via quantum tunneling. — The universe isn't old enough for this form to come into existence. MECO: A hypothetical alternative to black holes. Q0957+561: Planck star: A star where the energy density is around the Planck density.
New examinations of this behemoth star suggest it is both smaller — and closer — than astronomers believed. This red giant star will, one day, explode as a supernova. However, it is ...