Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Spiral Galaxy Galaxies flash cards Refer to: Pg. 179-217
Document related concepts
Transcript
Galaxies flash cards Refer to: Pg. 179-217 Spiral Galaxy Flat, large disk Interstellar matter and young (open) star clusters. Halo has thinly scattered stars, star clusters, and gas. Nuclear bulge has a cloud of stars at the center Ellipsoidally formed bulge component, consisting of an old stellar population without interstellar matter, and often associated with globular clusters. • Spiral arms= bright stars arranged in spiral patterns and/or bar structures. • Young population I stars and old population II stars. • The Sun is one of over 100 billion stars in the spiral galaxy, the Milky Way. • • • • • Elliptical Galaxy Look luminous spirals, without a disk component and in an ellipsoidal shape. • Don’t rotate as a whole galaxy. • Contain little or no interstellar matter. • Old population II stars only. • Irregular Galaxy • Distorted by the gravitation of their intergalactic neighbors. • Do not fit well into the scheme of disks and ellipsoids. • Irregular shapes. Top View of the Milky Way Galaxy Side View of the Milky Way Galaxy Sources: Backman/Seeds’ Astro; http://seds.org/messier/galaxy.html; http://www.danielsevo.com/astronomy/astro_galaxy.htm
