Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


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
remaining cards
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:
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


Gravity, Moon, Earth, Star and, the Sun

How does gravity affect the Moon and its relationship with Earth? Earth's gravity_______________________.
Which force keeps satellites in orbit? gravity
What causes an object to fall to the Earth when dropped? Gravity
What time of day, and time of year, will your shadow be the shortest? noon time in the summer
Compared to the shadow cast by an object in the early morning, its shadow at noontime would be _____________. shorter and fatter
Why does the Sun appear to rise and set each day? Earth rotates
What is Earth's orbit? It is an ellipse, and Earth is closer to the Sun when the northern hemisphere has winter.
How many days does it take for the Moon to make one revolution around Earth? 28 days
Approximately how long does it take for Earth to make one revolution around the Sun? one year
Why are different constellations seen in the night sky during different times of the year? The Earth revolves around the sun
Why do the stars seem to move from east to west in the night sky? Earth rotates on its axis
The Earth takes 365.25 days to orbit around the Sun. This results in an __________________________________. an extra day is added to the month of February every four years.
Why do stars appear to move in the night sky? The star's apparent movement is ___________________________. a result of Earth's movement.
A constellation is a group of stars visible in one area of the sky that ________________________________. form a path
What causes the phases of the Moon? The Earth's shadow on the moon
Why do we always see the same side of the moon from the Earth? The moon's rotation and orbit occur at the same rate
Created by: smpark0414