Save
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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
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

Physics ch. 13

QuestionAnswer
Most of the Mass of the Universe is (be careful) dark matter
Dark matter is made of we don't know
Doppler shift for galaxies is usually toward red
The discovery of dark energy means that the expansion of the universe is accelerating
In the Big Bang Theory there is no center to the universe
What was made in the first 4 minutes after the Big Bang (all that apply) hydrogen, helium
To become a black hole, an object must have enough mass that the escape velocity exceeds c
Dark energy makes the Universe speed up
When you look at a galaxy 5 billion light years away, you see this galaxy as it was 5 billion years ago
Who is famous for his estimate of extraterrestrial intelligence? Drake
The expansion of the Universe is accelerating. Physicists attribute this to dark matter
To make a black hole, we need high mass in a small radius
Most of the mass in the universe is made of planets
Oxygen and nitrogen were created within a star
What is Nemesis a theoretical star that orbits the Sun, making comets and asteroids veer toward Earth
light from the Andromeda Galaxy reaches us in several millions of years
The Age of the universe is closest to 10 billion years
For the Earth to become a black hole, it would have to be reduced to the size of a coin
If the sun were made into a black hole, it's radius would be approximately a few kilometers
If we turn the Sun into a black hole, then the force on the Earth will be unchanged
Choose all of the following that are NOT part of our solar system the Andromeda Galaxy
A galaxy is a large collection of stars
A light year is a distance
Created by: mwest
 

 



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