AST201H5 Lecture Notes - Lecture 3: Astronomical Unit
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Here are the ways we use numbers in this course: (a) straight numbers, such as the diameter of earth = 12,756 km or the radius of. Note: these numbers must have units (b) numbers as ratios comparing two objects, such as. Dmoon = 0. 272 dearth note: ratios do not have units (c) huge/tiny numbers in scienti c notation, such as the distance between the. We use matrix to plant out the di erent distances with asteroids and suns f (n) = {n /2. (n + 1)/2: the solar system is huge compared to earth, but it is tiny compared to the whole. Universe astronomy deals with huge distances and huge volumes: the solar system is very old compared to a human lifetime, but it has not been here forever. Radius (r) of the solar system is about half way to the nearest star 100,000 au =
