{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Astronomy 10 11.20.06

Astronomy 10 11.20.06 - o More light between the arms then...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Astronomy 10 Types of Galaxies 11/20/06 There are elliptical galaxies o Good name because they actually are elliptical o Come in all three sized (dwarf, normal, and giant) o There is no difference between the bulge of the disk galaxies and an entire elliptical galaxy o Physical structure: elliptical o Star population I: none Means almost no gas and no young stars Won’t have the stars in the top of the main sequence (only yellow, orange, or red stars) o Star population II: all o Giant elliptical Only found in the centers of galaxy clusters Thought to be the result of mergers of galaxies There are Spiral galaxies o They tend to be the prettiest galaxies o Has a nucleus and a bulge o There are O and B stars, which tend to make a blue tint o Arms almost never continue to the center The arms are usually patchy and almost never go straight to the center
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: o More light between the arms then outside of the galaxy, which means that there is a lot of stuff in between the arms o Arms are not physical structures o Can’t define an arm unless you define where you are looking at it o Often quite dusty o Physical structure: disc o Star population I: disc o Star population II: bulge and halo • Irregular o Very rare, one or two percent of the galaxy population o Elliptical with oddity Physical structure: elliptical Star population I: sometimes in the oddity Star population II: Mostly o Disc with oddity Physical structure: disc Star population I: disc, and sometimes in the oddity Star population II: Bulge and Halo o Unsymmetrical Physical structure: irregular Star population I: all Star population II: none...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online