Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

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.
Your email address is only used to allow you to reset your password. See 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.
Didn't know it?
click below
Knew it?
click below
Don't Know
Remaining cards (0)
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

Ch. 21 Earth Science

7th Grade finals test

telescope A device that makes distant objects appear to be closer
electromagnetic radiation energy that can travel through space in the form of waves
wavelength distance between the crest of one wave and the crest of the next wave
spectrum a range of different colors of different wavelengths
optical telescope uses lenses or mirrors
refracting telescope uses convex lens
convex lens a piece of transparent, curved glass
reflecting telescope a curved mirror that collects light
radio telescopes curved lenses that reflect other waves and focus on radio
observatory a building that contains one or more telescopes
constellation an imaginary pattern "drawn" by the stars
spectrograph breaks light in to colors and and produces images of it
apparent brightness brightness seen on earth
absolute brightness the brightness the star would have if it were at a standard disatnce from Earth
light year distance that light travels in one year
parallax apparent change in position of an object when looking at it from a different place
main sequence surface temperature increases, and is the main life of a star
binary star a two star system
eclipsing binary a binary system in which the dim star eclipses the bright star
open cluster a much less dense cluster of stars
globular cluster a much more dense cluster of stars with millions of them
galaxy a group of stars, dust, and ice held together by gravity
quasar active young galaxies with giant black holes
universe all of space and everything in it
Created by: WhiteWyvern95
Popular Earth Science sets




Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
restart all cards