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
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

Earth,Moon,and Sun

PS Ch. 12.1

TermDefinition
Astronomy The study of the Moon, Stars, and other objects in space
Axis the imaginary line that passes through Earth’s center and the North and South Poles
Rotation the spinning of Earth on its axis
Revolution the movement of one object around another
Orbit a path
Solstice when the sun is farthest North or South of the equator
Equinox when the noon sun is directly above the equator (occurs twice a year)
Gravity Attracts all objects toward each other
Law of Universal Gravitation States that every object in the universe attracts every other object
Mass The amount of matter in an object
Weight The force of gravity on an object
Inertia The tendency of an object to resist a change in motion
Newton’s First Law of Motion States that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by an unbalanced force
Created by: alondraharo