AST-L23-ch1617__3 - 1 final exam Monday we will discuss the...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 final exam Monday we will discuss the Big Bang Wednesday we will finish the Big Bang and review for the final exam Galaxies 2: Mostly Other Galaxies Today’s Lecture: purpose & goals AST 1002 Planets, Stars and Galaxies Hubb l e Deep F i e l d– North s ome of the mo s t d i s tant ga l ax i e s L ook i ng at an ‘ empty pat c h of s ky 1) Types of Galaxies 2) Galaxy Clusters and galaxy collisions 3) Dark Matter puzzle 4) The Expanding Universe Review: The Milky Way in Visible Light called v i a l a c t i a (latin) or ga l ax i a s kuk l o s (greek) – “Milky Way” Almost everything we see with the naked eye is our galaxy Most individual visible stars seen with the naked eye are ‘foreground stars ’ within a few hundred light years of us. Andromeda Galaxy The exceptions: 2 Milky Way: Structure Disk Near the Sun low density of stars ( 1 star per 330 330 l.y. 3 ) Younger Population I stars, including Blue giants Lost of gas and dust Bulge galactic nucleus high density off stars ( 10 10 million million stars per l.y. 3 ) Older (10 billion year old) Population II stars, mostly red dwarves Halo The globular clusters and many individual widely separated older Population II stars Messier Objects 1784 – Charles Messier (French astronomer) he was a comet hunter Identified 103 objects in the sky which were not stars ( 109 in list now). these were fuzzy objects when viewed in small telescopes. wanted to separate the stationary ‘dim fuzzy’s from comets he was searching for. actually galaxies , globular and open clusters , and nebulae . far away: appears dim and fuzzy. Now a very useful list of interesting and beautiful objects for amateur astronomers to look at. M80 – g l obu l ar c l u s ter M16 – Eag l e Nebu l a em i ss i on nebu l a w / embedded open c l u s ter M27 – Ring nebula p l anetary nebu l a M20 – Tr i f i d Nebu l a em i ss i on nebu l a M1 – Crab Nebu l a s upernova remnant Looking at Distant Objects...
View Full Document

This note was uploaded on 10/13/2011 for the course AST 1002 taught by Professor Gerstein during the Spring '08 term at FSU.

Page1 / 8

AST-L23-ch1617__3 - 1 final exam Monday we will discuss the...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online