Study Guides (256,409)
CA (124,634)
UTSG (8,518)
AST (173)
AST101H1 (85)

Mid2_

3 Pages
113 Views

Department
Astronomy & Astrophysics
Course Code
AST101H1
Professor
Clifford Orwin

This preview shows page 1. Sign up to view the full 3 pages of the document.
AST Study
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
10^11 m
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, youd see everything in the universe as it is now.
Light travels at a finite speed, so it takes time to reach us from wherever it is
coming.
Thus, no matter where you look, you are looking back in time.
You are seeing things the way they were when the light left them.
When you look at the sun, you are looking at it 8 minutes ago.
When you look at Andromeda, you are looking at it 2.5 million ly ago.
Stars are hue spheres of super-hot gas (plasma) that produces energy by nuclear
fusion (Smashing atoms together). The Sun is a fairly typical star.
Planets are large bodies which orbits stars. Planets may be various mixtures of
rocky, gaseous, or icy.
The asteroid Eros cant be a planet because its not a sphere.
Pluto cant be a planet because its orbit is full of other objects.
There are five known dwarf planets in the solar system: Pluto, Ceres, Makemake,
Haumea, and Eris
Comet is icy and Asteroid is rocky
A nebula is a cloud of gas and dust
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
AST Study 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 10^11 m 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, youd see everything in the universe as it is now. Light travels at a finite speed, so it takes time to reach us from wherever it is coming. Thus, no matter where you look, you are looking back in time. You are seeing things the way they were when the light left th
More Less
Unlock Document


Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit