ASTR 1101- Final Exam Guide - Comprehensive Notes for the exam ( 65 pages long!)

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Distance (ly) = (1ly/yr) x time (yr) is the same as . o . Thus we see proxima as it was 4. 2 years ago when the light left it (the look-back time) thus literally seeing into the past. The further away in distance you look the further back in time you are looking o . Dozens of objects like pluto have been discovered beyond neptune, these are considered dwarf planets. The age of the universe the 14 billion year history of the universe into the span of 1 year timeline. 11:59:55 all of our 10 thousand year written history. Orbits of sun, moon and plants/stars are all cantered on the earth. Celestial sphere is centered on the earth as a base of plotting locations o . North and south celestial poles on the top and bottom of the celestial sphere. Celestial equator an ring around the celestial sphere like the earths equator.