ASTR-122 Lecture Notes - Lecture 5: Active Galactic Nucleus, Inferior And Superior Planets, Protoplanetary Disk
8 Apr 2016
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Document Summary
A shell of gas surrounding a small, white star. The gas is usually illuminated by the star, producing a variety of colors and shapes. Planetesimala solid object that is believed to exist in protoplanetary disks and in debris disks. Planetesimals are formed from small dust grains that collide and stick together and are the building blocks that eventually form planets in new planetary systems. A form of ionized gas in which the temperature is too high for atoms to exist in their natural state. Plasma is composed of free electrons and free atomic nuclei. The apparent shift of the celestial poles caused by a gradual wobble of the earth"s axis. An explosion of hot gas that erupts from the sun"s surface. Solar prominences are usually associated with sunspot activity and can cause interference with communications on earth due to their electromagnetic effects on the atmosphere.
