Astronomy Ch 13
Study - Print - List Cards - Print - Play Memory - Add To Favorites| Title: | Astronomy Ch 13 |
| Description: | barred spiral galaxy A spiral galaxy with an elongated nucleus resembling a bar from which the arms originate. (p. 284) <br />cluster method The method of determining the masses of galaxies based on the motions of galaxies in a cluster. (p. 291) <br />distance indicator Object whose luminosity or diameter is known. Used to find the distance to a star cluster or galaxy. (p. 287) <br />elliptical galaxy A galaxy that is round or elliptical in outline and contains little gas and dust, no disk or spiral arms, and few hot, bright stars. (p. 284) <br />galactic cannibalism The theory that large galaxies absorb smaller galaxies. (p. 296) <br />gravitational lensing The process by which the gravitational field of a massive object focuses the light from a distant object to produce multiple images of the distant object or to make the distant object look brighter. (p. 293) <br />Hubble constant (H) A measure of the rate of expansion of the universe. The average value of velocity of recession divided by distance. Presently believed to be about 70 km/s/Mpc. (p. 290) <br />Hubble law The linear relation between the distances to galaxies and their velocity of recession. (p. 290) <br />irregular galaxy A galaxy with a chaotic appearance, large clouds of gas and dust, and both population I and II stars, but without spiral arms. (p. 285) <br />Large Magellanic Cloud An irregular galaxy that is a satellite of our Milky Way Galaxy. It is visible in the southern sky. (p. 285) <br />look-back time The amount by which we look into the past when we look at a distant galaxy. A time equal to the distance to the galaxy in light-years. (p. 288) <br />megaparsec (Mpc) A unit of distance equal to 1,000,000 pc. (p. 287) <br />poor galaxy cluster An irregularly shaped cluster that contains fewer than 1000 galaxies, many spiral, and no giant ellipticals. (p. 295) <br />rich galaxy cluster A cluster containing over 1000 galaxies, mostly elliptical, scattered over a volume about 3 Mpc in diameter. (p. 295) <br />ring galaxy A galaxy that resembles a ring around a bright nucleus. Believed to be the result of a head-on collision of two galaxies. (p. 297) <br />rotation curve method A method of determining a galaxy's mass by observing the orbital velocity and radius of stars in the galaxy. (p. 291) <br />Small Magellanic Cloud An irregular galaxy that is a satellite of our Milky Way Galaxy. It is visible in the southern sky. (p. 285) <br />spiral galaxy A galaxy with an obvious disk component containing gas; dust; hot, bright stars; and spiral arms. (p. 284) <br />starburst galaxy A galaxy undergoing a rapid burst of star formation. (p. 299) <br />tidal tail A long streamer of stars, gas, and dust torn from a galaxy during its close interaction with another passing galaxy. (p. 296) <br />velocity dispersion method A method of finding a galaxy's mass by observing the range of velocities within the galaxy. (p. 291) |
| Number of Cards: | 21 |
| Author: | thesuhys13 |
| Created: | 2006-04-30 |
| Tags: | astronomy |
| Private: | No |
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