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.

Remove Ads
Don't know
Know
remaining cards
Save
0:01
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:
Retries:
restart all cards




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

ESPS - O'Connor

O'Connor - ESPS Astronomy

QuestionAnswer
The early universe was primarily made up of what elements? Helium and Hydrogen
What is the ratio of hydrogen to helium in the early universe? Hydrogen made up approximately 73% of the early universe while Helium made up 25%. The other 2% were the other elements.
What does the process of nuclear fusion release? Nuclear fusion releases energy
Describe what kind of star creates a supernova explosion? Red giants and red supergiants.
How does a star's mass and elements change over it’s lifetime? The mass becomes greater and the elements become heavier.
What does an H-R diagram represent? The luminosity against their surface temperature or their color against their absolute magnitude.
What does analyzing the light that a star emits tell a scientist? The luminosity and the elements that the star is composed of.
What color are the hottest stars? The hottest stars are blue.
What is the difference between absolute magnitude and apparent magnitude? Absolute magnitude is how bright something actually is and apparent magnitude is how bright something appears from Earth.
In a main sequence star what fuses together? Helium and hydrogen nuclei.
What color are the coolest stars? The coolest stars are red.
What is a Nebula? A cloud of dust and/or gas in outer space.
What is a Neutron Star? The collapsed core of a giant star that had between 10-29 masses.
What is a Black Hole? A part of space that has such a great gravitational pull that nothing can escape it, not even light.
What is a Supernova? A star that's brightness suddenly gets bigger and then loses all fo it's matter.
What is a Protostar? A contracting mass made up of gas that's in the early stage of becoming a star.
What's a White Dwarf? A small extremely dense star that is normally the size of a planet.
What is a Red Giant? A very large star that's extremely bright but has very low surface temperature.
In the equation E=mc^2 what does E stand for? E stands for energy.
In the equation E=mc^2 what does m stand for? m stands for mass.
In the equation E=mc^2 what does c stand for? c stands for the speed of light in a vacuum.
Created by: EgoO'Connor