NATS 1760 Lecture Notes - Lecture 3: Cosmic Dust, Angular Diameter, Net Force
5 Dec 2018
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Document Summary
Planet: a moderately large object that orbits a star and shines due to reflected light (rocky, icy, and gaseous) Star: a luminous ball of gas emitting energy as heat and light. Moon: a rocky or icy object that primarily orbits a planet. Solar system: a star and all the material that orbits it including its planets and moons. Galaxy: the largest single assembly of stars in space held together in their mutual gravity and orbiting a common centre. Universe: the sum of all matter, energy, galaxy and space that is everything within and between all galaxies. Nebula: interstellar dust clouds of gas or dust from which starts and planets ultimately form. Scale of the universe and our place it. Distance from the sun and earth: 1a. u:93 million miles. Distance to the edges of the universe, quasars: redshift. Milky way: 120,000 lights years (has about 100 billion stars) Light travels at a finite speed of c=300,000 km/s.
