Download 15.4 Star Systems and Galaxies

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Transcript
Star Systems and Galaxies
Chapter 24
I. Star Systems and Planets
A. Star system-groups of two or more stars
1. Binary stars - two stars or double stars
a. Eclipsing binary-a system in which
one star blocks the light from another
II. Planets Around Other Stars
A. Astronomers study gravitational effects on stars to
see if there is a planet
III. Galaxies-classified into three main categories
A. Spiral Galaxies - have the shape of twin spirals-have
arms like pinwheels
1. The Milky Way (our galaxy) is a spiral galaxy
B. Elliptical Galaxies - look like flattened balls
1. Contain little gas and dust, so no new stars
formed
C. Irregular Galaxies - don’t have regular shapes
3 Types of Galaxies
Spiral
Elliptical
Irregular
The Milky Way
Flattened balls
No regular shape