Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards
share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

unit 2 lesson 1

vocab terms

TermDefinition
solar system the sun of all the planets and other bodies that travel around it
galaxy a collection of stars, dust and gas bound together by gravity
planet a relatively large spherical body that orbits a star
light year the distance that light travels in one year about 9.46 trillion kilometers
star a large celestial body that is composed of gas and that emits light the sun is typical star
universe space and all the matter and energy in it
luminosity the actual brightness of an object such as a star
apparent magnitude the brightness of a star as seen from earth
absolute magnitude a measure of how bright a star would be if it were seen from a standard distance
Created by: 4804051117