ASTR 1000 Study Guide - Comprehensive Final Exam Guide - Earth, Venus, Sun
20 Nov 2018
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But a long time ago it used to be march 25th. Average distance of the earth from the sun: light-year (ly) Measures how far light travels in one year. 300,000km/s * seconds in one year = 9,000,000,000km: parsec (pc) The only measurement that is used with normal distance for example kpc or mpc. It is a bit bigger then ly. Most of the universe (vast bulk) is unobservable to us. Galaxies are not randomly distributed, they are found in sheets, voids etc. We are located in the outer part of the milky way galaxy - dust and gas is found here. These are known as models of atoms, bottom left is closest to the actual look of an atom. A human grouping of stars in the night sky into a recognizable pattern. Essential a model of how we perceive the nighttime sky. The big dipper is not a constellation, it is actual a alsteration.
