Knowra Astronomical masses and mass distributions Astronomical masses and mass distributions Astronomical masses and mass distributions describe how much matter celestial objects contain and how that matter is arranged within them and across the universe.
Kepler's laws of planetary motion : Three laws describe how planets orbit the Sun, including the relation between orbital period and distance. Orbital periods and distances yield the combined mass of an orbiting system.
Gravitational mass : Mass quantified by the strength of an object's gravitational interaction with other bodies. Most astronomical mass estimates begin with the gravitational influence of an object.
Stellar structure : The internal arrangement of a star's pressure, temperature, density, and energy transport. A star's mass sets key conditions for its internal structure and lifetime.
Baryonic mass : The mass in ordinary matter made of baryons, chiefly protons and neutrons. It distinguishes directly inventoried ordinary matter from total gravitating mass.
Virial theorem : A relation between kinetic and potential energy in a stable, gravitationally bound system. It lets stellar and galactic motions constrain the mass producing their gravity.
Baryonic matter : Ordinary matter composed chiefly of protons, neutrons, and electrons. Its stars, gas, and dust form the visible components whose masses astronomers inventory.
Galaxy rotation curve : A graph of orbital speed versus distance from a galaxy's center. Its shape reveals how galactic mass is distributed beyond the bright disk.
Dynamical mass : The mass inferred from the motions of objects under a system's gravitational influence. It can exceed the mass inferred from luminous material when unseen matter contributes.
Gravitational lensing : The bending of light by gravity, which can magnify or distort images of background objects. Lens distortions reveal projected mass, including matter that emits little or no light.
Dark matter : Matter inferred from gravitational effects but not detected through emitted or absorbed light. It accounts for mass that galaxy motions and lensing reveal beyond luminous matter.
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