Galaxies Galaxy Spiral Elliptical Irregular Milky Way Local Group.

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Presentation transcript:

Galaxies Galaxy Spiral Elliptical Irregular Milky Way Local Group

Galaxy (Brainpop) a large group of gas, dust, and millions of stars.

3 main shapes : SPIRAL— most galaxies Elliptical —older stars Irregular--younger

The Milky Way--Brainpop

Milky Way Galaxy (about 100-300 billion stars) (ly=light year=DISTANCE light travels in 1 year=6 trillion miles) about 100,000 ly wide and about 2,000 ly thick we are 30,000 ly from the center (or 250 million billion km) takes us 230 million years to make one orbit (revolution) Our closest galaxy is Andromeda Galaxy (2 million ly away) Spiraling arms Contains oldest stars DYK: If every star in the Milky Way was a grain of salt, they would fill an Olympic sized swimming pool.

Milky Way as seen from Earth

Galaxies exist in groups called CLUSTERS Our Milky Way belongs to a cluster of 32 galaxies called the Local Group. The Milky Way is the second largest galaxy in this group (Andromeda is the largest). Clusters group together to form superclusters. (We are in the Virgo supercluster)