Save
Upgrade to remove ads
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

Astronomy T/F 2

True False questions

QuestionAnswer
The solar wind is constantly removing mass from the Sun. True
During the fusion process, mass in converted into energy. True
The must abundant element in the Sun in hydrogen. True
A parsec is about 3.3 light years. True
Less than 100 stars lie within 5 parsecs of the Sun. True
If a star has a parallax of 0.25", then its distance is about 13 light years. True
Our sun lies about the middle of the main sequence and the H-R diagram. True
Main sequence stars are fusing hydrogen into helium in their cores. True
The mass of a newly formed star will determine its position on the main sequence. True
There is as much mass in the voids between the stars as in the stars themselves. True
The gas in the interstellar medium consists of mostly heavy elements. False
Globular clusters contain mostly blue stars False
Young open clusters contain a lot of hot, young blue-white stars True
Globular clusters are typically much older than open clusters True
A star cluster with a lot of hot, blue stars must be relatively young. True
Helium fusion requires a higher temperature than hydrogen fusion True
The helium flash stage lasts several thousand years False
During the helium flash stage, the star's luminosity increases False
It is the formation of iron in an evolved giant's core that triggers the Type II supernova event True
Elements heavier than iron are formed mainly in supernovae True
A star system can become a Type I supernova several times False
Type II supernova spectra are poor in hydrogen, as they used it all up before leaving the main sequence False
The spectra of the oldest of the oldest stars show the most heavy elements False
A nova is a sudden outburst of light coming from an old main-sequence star False
It takes less and less time to fuse heavier and heavier elements inside a high-mass star True
Because of stellar nucleosynthesis, the spectra of old stars show more heavy elements than those of young stars False
In a neutron star, the protons and electrons are fused together, leaving only neutrons True
Stars of less than 8 solar masses will not go supernova True
A neutron star is what remains after a Type II supernova explosion has destroyed the star True
Pulsars are created in a Type I supernova False
The pulses from a pulsar are most likely coming from localized areas near the magnetic poles True
No planets have ever been found around any pulsars False
Only high-energy gamma rays can escape the event horizon of a black hole False
The escape speed at the event horizon of a black hole is c, 300,00 km/sec True
Special relativity says that c, the speed of light, is the maximum velocity for both matter and energy in our universe True
No communication is possible across an event horizon True
Einstein's prediction of the curvature of space was confirmed by the 1919 total solar eclipse True
Newly formed neutron stars have extremely strong magnetic fields True
The Milky Way is similar in many ways to M31, the Andromeda Galaxy True
Shapley found the globulars were strongly concentrated toward Sagittarius True
The stars of the halo are all old, and those of the disk area all new False
The Galactic halo contains about as much gas and dust as the Galactic disk. False
The Galactic halo contains only old stars True
The most likely explanation of the high-speed motion of stars and gas near the Galactic center is that the stars and gas are orbiting a supermassive black hole True
Created by: dfw90
 

 



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