Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

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.
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.
Don't know
remaining cards
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:
restart all cards
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



Nebula A large cloud of dust and gas in space
Protostar A contracting cloud of gas and dust; the earliest stage of a star's life
Small-medium mass star An average sized star that can live up to 10 billion years. Our Sun is a medium mass star.
Red Giant a large, reddish star late in it's life cycle.
Planetary Nebula A glowing shell of gas that has been blown off an old star.
White Dwarf A small, hot, dim star that is the leftover center of an old star
Black Dwarf A white dwarf that has burnt out completely.
High-mass star stars that live much shorter lives and are much larger than our sun
Supergiant an extremely bright star of very large diameter and low density
Supernova An enormous explosion of a giant star
Neutron Star A very tiny star that has collapsed under its own gravity. To the point that the electrons and protons have smashed together to form neutrons.
Black Hole An object in space whose gravity is so strong not even light can escape.
spiral galaxy A galaxy with a bulge in the center and very distinctive spiral arms. Our Milky Way is a spiral galaxy.
Elliptical Galaxy A galaxy shaped like a round or flattened ball, generally containing only old stars
Irregular Galaxy A galaxy that does not have a regular shape
Quasar An enormously bright, distant galaxy with a giant black hole at its center
Universe All of space and everything in it
Scientific notation A mathematical method of writing numbers using powers of ten.
Radio waves Least energetic, lowest frequency, longest wavelength
microwaves Electromagnetic waves that have shorter wavelengths and higher frequencies than radio waves.
infrared waves Electromagnetic radiation with long wavelengths which is found in the invisible part of the spectrum. Human beings experience infrared waves as heat. Right before visible light
Visible Light Electromagnetic waves that you can see ROY G. BIV (Red, orange, yellow, green, blue, indigo (sometimes indigo is left out) and violet
X Rays electromagnetic waves with wavelengths shorter than ultraviolet rays, but longer than gamma rays
Ultraviolet light Electromagnetic radiation of several wavelengths is used to control microbial growth, Another type of electromagnetic wave produced by the sun that has shorter wavelenghts and higher frequencies than visible light. Can cause sunburns
Gamma Rays Electromagnetic waves with the shortest wavelengths and highest frequencies.
Light year The distance that light travels in one year, about 9.5 million million kilometers.
electromagnetic spectrum All frequencies
apparent brightness The brightness of a star as seen from Earth.
absolute brightness The brightness a star would have if it were at a standard distance from Earth.
wavelength The distance between two corresponding parts of a wave, such as the distance between two crests. Distance between two peaks.
Hertzsprung-Russell diagram a graph that shows the relationship between a stars surface temp and absolute magnitude/brightness.
Main Sequence the location on the H-R Diagram where most stars lie.
Pulsar a rapidly spinning neutron star that emits rapid pulses of radio and optical energy.
BIG BANG THEORY the theory that states the universe began with a tremendous explosion 13.7 billion years ago. Particles pulled together & exploded. Constantly expanded & later created stars, galaxies. Still expanding.
theory A hypothesis that has been tested with a significant amount of data
Can theories change? yes, as new evidence is discovered or new observations made
Galaxy A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity
Amplitude Heigth of the waves
Frequency Number of waves that pass a point in a period of time
Evidence to support the Big Bang Theory cosmic radiation, red shift, galaxies moving away from each other
Star colors Red - coolest, Yellow - Medium, Blue-white - hot
Created by: KallyEvans