AST101H1 Chapter : good notes
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AST101H1 Full Course Notes
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Chapter 1 our place in the universe. It therefore seems quite natural to assume that we live in an. One light-year is the distance that light can travel in 1 year about 10 trillion km. y the father away we look in distance, the further back we look in time. We simply have no hope of seeing or studying anything beyond the bounds of our observable universe. How far away are the stars? y nearest star system to our own, a three-star system called alpha centauri is about 4. 4 light-years away. It is very hard to detect planets in space y. Earth rotates from west to east counterclockwise as viewed from above the north pole which is why the. Earth s axis is tilted by 23. 5r from a line perpendicular to the ecliptic plane. This axis tilt happens to be oriented so that it points almost directly at a star called.