© 2014 pearson education, inc. the earth rotates around its axis once every day. how is earth...

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© 2014 Pearson Education, Inc. The Earth rotates around its axis once every day. How is Earth moving through space? • Contrary to our perception, we are not "sitting still." • We are moving with Earth in several ways, and at surprisingly fast speeds.

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Page 1: © 2014 Pearson Education, Inc. The Earth rotates around its axis once every day. How is Earth moving through space? Contrary to our perception, we are

© 2014 Pearson Education, Inc.

The Earth rotates around its axis once every day.

How is Earth moving through space?

• Contrary to our perception, we are not "sitting still."

• We are moving with Earth in several ways, and at surprisingly fast speeds.

Page 2: © 2014 Pearson Education, Inc. The Earth rotates around its axis once every day. How is Earth moving through space? Contrary to our perception, we are

© 2014 Pearson Education, Inc.

How is Earth moving through space?

• Earth orbits the Sun (revolves) once every year:– at an average distance of 1 AU ≈ 150 million kilometers.– with Earth's axis tilted by 23.5º (pointing to Polaris)

• It rotates in the same direction it orbits, counterclockwise as viewed from above the North Pole.

Page 3: © 2014 Pearson Education, Inc. The Earth rotates around its axis once every day. How is Earth moving through space? Contrary to our perception, we are

© 2014 Pearson Education, Inc.

How is our Sun moving in the Milky WayGalaxy?• Our Sun moves randomly relative to the other stars in

the local solar neighborhood and orbits the galaxyevery 230 million years, at a typical speed of more than 70,000 km/hr.

Page 4: © 2014 Pearson Education, Inc. The Earth rotates around its axis once every day. How is Earth moving through space? Contrary to our perception, we are

© 2014 Pearson Education, Inc.

• Galaxies are carried along with the expansion of the universe and space is created between them.

How do galaxies move within the universe?

Page 5: © 2014 Pearson Education, Inc. The Earth rotates around its axis once every day. How is Earth moving through space? Contrary to our perception, we are

© 2014 Pearson Education, Inc.

Hubble discovered that

• The more distant the galaxy, the faster it is racing away.

• Conclusion: We live in an expanding universe.

Page 6: © 2014 Pearson Education, Inc. The Earth rotates around its axis once every day. How is Earth moving through space? Contrary to our perception, we are

© 2014 Pearson Education, Inc.

Are we ever sitting still?

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