AST101H5 Lecture Notes - Lecture 1: Milky Way, Scientific Notation, Deep Time
Document Summary
Chapter 1 - our place in the universe. Thursday, september 10, 2015. Earth is insignificant, except that we live here. Our solar system belongs to the milky way galaxy. The solar system formed billions of years ago. Sun - heart of the solar system, ordinary star. Comets - ice- rich object that orbit a star. edge of the solar system ~ half way to the nearest star ~ 100,000 au or 1. 5 x 1013 km (two squiggle lines means about) Earth was believed to be the centre of the universe from the time of greek astronomy (2200 years ago) until the year 1500. Solar system - the sun and all the objects that belong to the sun - a large family. Jupiter has moons discovered by gallelayo, at the time he discovered 4 however, there are way more. There are many other solar systems, far beyond ours.
