ASTR-122 Lecture Notes - Lecture 2: Photosphere, Sonic Boom, Eyepiece
8 Apr 2016
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Document Summary
A term used to describe matter in the universe that cannot be seen, but can be detected by its gravitational effects on other bodies. A ring-shaped circumstellar disk of dust and debris in orbit around a star. Debris disks can be created as the next phase in planetary system development following the protoplanetary disk phase. They can also be formed by collisions between planetesimals. The angular distance of an object in the sky from the celestial equator. The amount of matter contained within a given volume. Density is measured in grams per cubic centimeter (or kilograms per liter). The density of water is 1. 0, iron is 7. 9, and lead is 11. 3. The surface of the sun or other celestial body projected against the sky. Two asteroids that revolve around each other and are held together by the gravity between them. The apparent change in wavelength of sound or light emitted by an object in relation to an observer"s position.
