ASTR-122 Lecture Notes - Lecture 3: Celsius, Accretion Disk, Lenticular Galaxy
8 Apr 2016
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Document Summary
The name given to the spherical region surrounding the center, or nucleus of a galaxy. A tight concentration of stars and gas found at the innermost regions of a galaxy. Astronomers now believe that massive black holes may exist in the center of many galaxies. Galaxies are found in a variety of sizes and shapes. Our own milky way galaxy is spiral in shape and contains several billion stars. Some galaxies are so distant the their light takes millions of years to reach the earth. The name given to jupiter"s four largest moons, io, europa, callisto & ganymede. They were discovered independently by galileo galilei and simon marius. The highest energy, shortest wavelength form of electromagnetic radiation. An orbit in which a satellite"s orbital velocity is matched to the rotational velocity of the planet. A spacecraft in geosynchronous orbit appears to hang motionless above one position of a planet"s surface.
