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GROUPS OF STARS WARM UP • Compare the life of a star to the life of a human. Describe how the life stages are similar. You will need to choose the life cycle of either a lowmedium mass star OR a high mass star. CONSTELLATIONS • Groups of stars that appear to form a pattern as seen from Earth • These stars aren’t necessarily close together, they just happen to lie in the same general direction as viewed from Earth STAR SYSTEMS • Many stars exist in groups of two or more stars that are held close together because of gravity • More than half of all stars are members of star systems • Is our Sun part of a star system? STAR CLUSTERS Pleiades – all of these stars formed together in the same nebula, they are all about the same age and distance from earth. STAR CLUSTER • A group of stars that formed from the same nebula • This means they formed at about the same time and they are all about the same distance from Earth GALAXIES GALAXIES • Huge groups of individual stars, star systems, star clusters, dust and gas bound together by gravity • Four types of galaxies • Spiral • Barred-Spiral • Elliptical • Irregular SPIRAL GALAXIES BARRED-SPIRAL GALAXIES ELLIPTICAL GALAXIES IRREGULAR GALAXIES MILKY WAY GALAXY – FROM EARTH MILKY WAY GALAXY FACTS • Contains 200 – 400 billion stars • Over 100,000 light years across • Average thickness is 10,000 light years, but its 30,000 light years in the center • Every star you can see with the unaided eye is in the Milky Way galaxy • The Sun is in one of the spiral arms about 2/3 of the way (or about 27,000 light years) from the center of the galaxy • The sun orbits once around the Milky Way every 220 million years • At the center of the Milky Way is a bulge of stars surrounded by star clusters • Stars are forming out of dust in the spiral arms • The next closest galaxy is Andromeda, 3 million light years away (THIS GALAXY IS MOVING TOWARDS THE MILKY WAY, THEY WILL EVENTUALLY COLLIDE!!! This event will occur in about 5 billion years…) • What's REALLY at the center of the Milky Way?