General astronomy

General astronomy

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General astronomy

astronomy

Astronomy; General astronomy

a discipline that uses the scientific method to understand the physical universe (usually beyond the Earth's atmosphere).

astrophysics

Astronomy; General astronomy

a branch of astronomy that deals with the physical properties and interactions of celestial bodies---the application of the principles of physics to celestial bodies and phenomena.

aurorae

Astronomy; General astronomy

light displays produced by molecules and atoms high up in an atmosphere. The gas particles are excited by collisions with solar wind particles that were deflected by the planet's magnetic field ...

autumnal equinox

Astronomy; General astronomy

specific moment in the year (on September 22) when the Sun is directly on the celestial equator, moving south of the celestial equator.

azimuth

Astronomy; General astronomy

position on the celestial sphere that is the number of degrees along the horizon away from the exact north point. Exact North = 0°, exact East = 90°, exact South = 180°, exact West = 270°, exact ...

Big Bang

Astronomy; General astronomy

a theory of the creation of the universe from an ultra-compact volume with very high temperatures about 13.7 billion years ago. The ultra-compact volume began expanding and is responsible for the ...