AST 2002 Lecture 1: Astronomy Chapter 1 Lecture
Document Summary
Universe, local supercluster, local group, milky way galaxy, solar system, earth, North america, usa, florida, orlando, main campus, cb2 106. Au astronomical unit (distance from the center of the earth to the center of the sun) Ly light year (distance light travels in 1 year) Planets: a celestial body moving in an elliptical orbit around a star. Sun: the star around which the earth orbits. Asteroids: a small rocky body orbiting the sun. Comets: a celestial object consisting of a nucleus of ice and dust and, when near the sun, a tail of gas and dust particles pointing away from the sun. Meteoroids: a small body moving in the solar system that would become a meteor if it entered the earth"s atmosphere. Nebula: a cloud of gas and dust in outer space. Stars: xed luminous points in the night sky. Brown dwarfs: a planet is not hot enough or heavy enough to produce its own light.
