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Astrophysics, Cosmology & Relativity

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Astrophysics, Cosmology & Relativity

Accretion Disk

A rotating disk structure formed by infalling diffuse matter orbiting a massive central body like a white dwarf, neutron star, or black…

L_acc = η M_dot c² (Efficiency η ~ 0.1 to 0.42) Watts or Solar Luminosity Astrophysics, Cosmology & Relativity

Astronomical Unit (AU)

An astronomical unit of length defined as exactly 149,597,870,700 meters, representing the mean distance from Earth to the Sun.

1 AU = 149,597,870,700 m ≈ 1.496 × 10¹¹ m Astronomical Units (AU)