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AST101H1 : Mid2_

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roseraven804
12 Dec 2010
School
UTSG
Department
Astronomy & Astrophysics
Course
AST101H1
Professor
Clifford Orwin

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AST101H1 Full Course Notes
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AST101H1 Full Course Notes
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Document Summary

Lecture 1: the solar system is huge and the vast majority of it is empty, tiny quantities of gas and dust fill the space. 1 astronomical unit is the average distance between earth and the sun = 1. 5 x. 1 light year = 9. 46 x 10^12 km = distance light travels in one year. 1 au = 8 light minutes: the milky way galaxy is our galaxy as seen from earth, the andromeda galaxy is 2. 5 million ly away, largest galaxies to milky way. If light moved at infinite speed, you"d see everything in the universe as it is now. The sun is a fairly typical star: planets are large bodies which orbits stars. Large galaxies, like the milky way, contain about 100 billion stars, all orbiting a common center of gravity: the stuff in the universe is not static. Lunar eclipses can occur only at full moon, solar eclipses can occur only at new moon.

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Related Questions

The speed of light in a vacuum is exactly 299,792,458 m/s. This speed is sometimes used to provide a convenient yardstick for large astronomical distances. (a) A light-second is the distance light travels in one second. If the Moon is 3.84×108 m from the Earth (center to center), how many light-seconds away is it? (b) A light-minute is the distance light travels in one minute. If the Earth is 1.50×1011 m from the Sun, how many light-minutes away is it? (Your answer also represents the number of minutes it takes for light to reach the Earth from the Sun.) (c) A light-year is the distance light travels in one year. The Sun is 28,000 light-years from the center of the Milky Way galaxy. What is this distance in meters?

The diameter of our disk-shaped galaxy, the Milky Way, is about 1.0 &times105 light-years (ly). The distance to the Andromeda galaxy , which is the spiral galaxy nearest to the Milky Way, is about 2.0 million ly. If a scale model represents the Milky Way and Andromeda galaxies as dinner plates 25 cm in diameter, determine the distance between the centers of the two plates.

The diameter of our disk-shaped galaxy, the Milky Way, is about 1.0 × 105 light-years (ly). The distance to the Andromeda galaxy (Fig. PI.57), which is the spiral galaxy nearest to the Milky Way, is about 2.0 million ly. If a scale model represents the Milky Way and Andromeda

Chapter 1, Problem 1.57AP, The diameter of our disk-shaped galaxy, the Milky Way, is about 1.0 105 light-years (ly). The

galaxies as dinner plates 25 cm in diameter, determine the distance between the centers of the two plates.