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GROUPS OF STARS

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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 low-medium mass star OR a high mass star. . Constellations. - PowerPoint PPT Presentation

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Page 1: Groups of Stars

GROUPS OF STARS

Page 2: 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 low-medium mass star OR a high mass star.

Page 3: Groups of Stars

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

Page 4: Groups of Stars
Page 5: Groups of Stars
Page 6: Groups of Stars
Page 7: Groups of Stars

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?

Page 8: Groups of Stars

STAR CLUSTERS

Pleiades – all of these stars formed together in the same nebula, they are all about the same age and distance from earth.

Page 9: Groups of Stars

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

Page 10: Groups of Stars

GALAXIES

Page 11: Groups of Stars
Page 12: Groups of Stars

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

Page 13: Groups of Stars

SPIRAL GALAXIES

Page 14: Groups of Stars

BARRED-SPIRAL GALAXIES

Page 15: Groups of Stars

ELLIPTICAL GALAXIES

Page 16: Groups of Stars

IRREGULAR GALAXIES

Page 17: Groups of Stars

MILKY WAY GALAXY – FROM EARTH

Page 18: Groups of Stars

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?

http://www.youtube.com/watch?v=arBhS5ms0Z8

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