Star Groups 30.3

Star Groups 30.3

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Constellations• Groups of stars that form a pattern in

the sky• 88 recognized by astronomers to

divide the sky into sectors• Appear to shift to the west a little

each night due to revolution of earth so each season has a different set of constellations

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Leo and Orion

http://www.astronomy.ohio-state.edu/~pogge/Ast162/Movies/proper.html

…it’s not actually a constellation….

…it’s an asterism.

Galaxies• Large groups

of stars bound by gravitational attraction

• May be a trillion galaxies!

• Avg. 100 LY wide with 100 billion stars per galaxy

Types of Galaxies Spiral

Elliptical

Irregular

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Hubble Galaxy Classification

Our Galaxy - The Milky Way• Cloudlike band across the sky

• Spiral Galaxy- we are in one of the armsThe sun takes 200 million years to revolve

around the center

Star Clusters

• Galaxies also contain groups of stars• They can be open clusters or globular

clusters

Globular Cluster - M80

Binary Stars

• Most stars in the galaxy are binary or multiple star systems

• They revolve around each other

Star Groups 30.3

Documents

star groups star groups

galaxieslarge groups

sky spiral galaxy

constellationsgroups

groups of starsthey

center star clustersgalaxies

multiple star systemsthey

open clusters