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For a star of 1 M ☉, the resulting white dwarf is of about 0.6 M ☉, compressed into approximately the volume of the Earth. White dwarfs are stable because the inward pull of gravity is balanced by the degeneracy pressure of the star's electrons, a consequence of the Pauli exclusion principle. Electron degeneracy pressure provides a rather ...
A hypergiant (luminosity class 0 or Ia +) is a very rare type of star that has an extremely high luminosity, mass, size and mass loss because of its extreme stellar winds.The term hypergiant is defined as luminosity class 0 (zero) in the MKK system.
A preon star is a proposed type of compact star made of preons, a group of hypothetical subatomic particles. Preon stars would be expected to have huge densities , exceeding 10 23 kg/m 3 . They may have greater densities than quark stars, and they would be heavier but smaller than white dwarfs and neutron stars. [ 6 ]
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And if the star were hyper-massive, m 1 →+∞, then under Newtonian gravity, the system is stable whatever the planet and trojan masses. And if m 1 / m 2 = m 2 / m 3 , then both must exceed 13+√168 ≈ 25.9615. However, this all assumes a three-body system; once other bodies are introduced, even if distant and small ...
In the Big Bang, the expanding Universe causes matter to dilute over time, while in the Steady-State Theory, continued matter creation ensures that the density remains constant over time.
The twinkling of the brightest star in the night sky Sirius (apparent magnitude of -1.1), shortly before upper culmination at the meridian, at 20° above the southern horizon. In 29 seconds, Sirius appears to move 7.5 arcminutes from left to right.
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