AST101H1 Lecture Notes - Lecture 2: Milky Way, Local Group

• School: UTSG
• Department: Astronomy and Astrophysics
• Course: AST101H1
• Professor: Bryan Gaensler

Document Summary

Lecture 2 how big is our solar system. Universe universe if you believe in multiple universes (cid:883)(cid:882) (cid:2869)(cid:2873) (cid:883)(cid:882) (cid:2869)(cid:2868) (cid:883)(cid:882) (cid:2874) (cid:883) (cid:883)(cid:882)(cid:2875) (cid:883)(cid:882)(cid:2869)(cid:2871) (cid:883)(cid:882)(cid:2870)(cid:2869) (cid:883)(cid:882)(cid:2870)(cid:2875) cell person earth solar system galaxy universe. Distance between the sun and earth: 150 000 000 000 m (150 billion m) 1 au is the average distance between the earth and the sun. This is the distance light can travel in one year. Stars balls of plasma which produces energy by nuclear fusion. That is, there can"t be a lot of other stuff orbiting the parent star in orbits very similar to the planet. If they fail the third definition, then they are dwarf planets e. g. pluto.