Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
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

6th Grade Chapter 21

Stars, Galaxies, and the Universe

QuestionAnswer
open cluster a loose grouping of a few thousand stars
gravity the force that tends to pull together the matter in stars
light-year a unit of distance
protostar the earliest stage of a star's life
eclipsing binary a star system in which one star blocks the light from another
parallax is used to determine a star's distance from Earth
pulsar a neutron star that appears to produce pulses of radio waves
star system groups of two or more stars
supernova the explosion of a dying high-mass star
constellations patterns of stars in the sky
big bang theory the theory that describes the formation of the universe
dark energy the mysterious force that may be causing the expansion of the universe to accelerate
hydrogen the most common chemical element in most stars
a light-year the distance light travels in a year
the Milky Way galaxy is an example of a spiral galaxy
According to Hubble's law the farther away a galaxy if, the faster it is moving away from us
absolute brightness of a star depends on its size and temperature
reflecting and refracting telescopes gather and focus visible light
how bright a star looks depends on its distance from Earth and how bright it actually is
black hole an object whose gravity is so strong that nothing, not even light, can escape
a star's color reveals a star's surface temperature
Created by: Mrs. Gordon
Popular Earth Science sets

 

 



Voices

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:
Retries:
restart all cards