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

Ch 24 Galaxies Pt1&2

Vocabulary

TermDefinition
Hubble Classification Scheme galaxy classification method according to their appearance
Spiral Galaxy composed of a flattened, star-forming disk, which may have spiral arms & a galactic bulge
Central Bulge thick distribution of warm gas and stars around the galactic center
Spiral Arm material in a galaxy forming a pinwheel-shaped design, beginning near the galaxy's center
Barred-Spiral "SB" galaxy that has a central bar of material, with spiral arms beginning near its ends
Elliptical Galaxy type of galaxy that ranges from highly elongated (E7) to nearly circular (E0) in appearance
Galactic Disk flattened region of gas & dust with active star formation bisecting a spiral galaxy's halo
Lenticular Galaxy (S0 or SB0) between an elliptical and a spiral galaxy; has a disk but no spiral arms
Irregular Galaxy does not fit into any of the other major categories in the Hubble classification scheme
Magellanic Clouds two small irregular dwarf galaxies that are gravitationally bound to the Milky Way (satellites)
Dwarf Galaxy small galaxy containing a few million stars
Galactic Tuning Fork diagram of Hubble's classification scheme
Cepheid Variable variable star whose luminosity changes within a period of more than a single day
Tully-Fisher Relation determines the luminosity of a spiral galaxy from its rotational velocity and mass
Type I Supernova explosive death of a white dwarf accreting too much mass in a binary system
Type II Supernova explosive death of a high-mass star
Standard Candle object with a known luminosity, such as a supernova, which can be used in estimating astronomical distances
Local Group small galaxy cluster that includes the Milky Way
Galaxy Cluster collection of galaxies held together by their mutual gravitational attraction
Virgo Cluster large cluster of galaxies in the constellation Virgo neighboring the Local Group
Universal Recession shows that almost all galaxies are moving away from each other
Hubble Diagram plot of galactic recession velocity versus distance; evidence for an expanding universe
Hubble Flow universal recession described by the Hubble diagram and quantified by Hubble's Law
Hubble's Law states recessional velocity is directly proportional to its distance
Cosmological Redshift redshift of an object that is due only to the Hubble flow of the universe
Recession Velocity rate at which two objects are moving away from one another
Hubble's Constant relationship between recessional velocity & distance (slope) in Hubble's Law
Observable Universe current spherical region of the universe that can be seen because radiation has had time to reach the Earth since the beginning of cosmological expansion
Created by: john_bailey720
Popular 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