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Astronomy
The scientific study of planets, stars, black holes, comets and other celestial bodies that make up outer space.
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Astronomy > Cosmology
brown dwarf
Astronomy; Cosmology
Astronomical object with a mass between the mass of a planet and the mass of a small star. It generates energy electromagnetic radiation by gravitational pressure, but its mass ...
white dwarf
Astronomy; Cosmology
A white dwarf is the final stage during the life of relative small mass stars like the Sun, after they have exhausted their nuclear fuel. Most of the outer material is expelled, ...
terraforming
Astronomy; Cosmology
A process to engineer and transform an inhospitable world into a livable one by affording it a sustainable source of oxygen, water, plant life, and correct air pressure and ...
absortion line
Astronomy; Cosmology
A dark line at a particular wavelength in the spectrum of electromagnetic radiation that has traversed an absorbing medium (typically a cool, tenuous gas between a hot radiating ...
Sub-categories
- Astrometry (117)
- Astronaut (14221)
- Comets (3684)
- Cosmology (251)
- Galaxy (567)
- General astronomy (16061)
- Mars (1797)
- Mathematical astronomy (130)
- Moon (1858)
- Planetary science (7689)
- Planetology (678)
- Radio astronomy (37)
- Solar system (663)