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THE INNER PLANETS • The four planets that are closest to the sun are called the inner planets. • They are all small and rocky. • They are sometimes called the terrestrial planets.

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Page 1: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

THE INNER PLANETS• The four planets that are closest to the sun are

called the inner planets.

• They are all small and rocky.

• They are sometimes called the terrestrial planets.

Page 2: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the
Page 3: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

The inner planets: note the spin and axis angles of each planet

Page 4: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

Earth• The Earth has an atmosphere that extends for

about 100 kilometers.

• It is 20% oxygen,78% nitrogen and a few other gases.

• 70% of the surface is covered with water.

• Earth has three main layers, a crust, a mantle, and a core.

• The crust is the hard rocky surface.

• The mantle is under the crust and is made of liquid rock.

Page 5: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

The Earth as seen from the

moon

Page 6: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

The Earth

Page 7: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

The inner core is most likely solid iron and nickel.

Page 8: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

• MERCURY

• Mercury is closest to the sun.

• It has no moons.

• It is a little larger than our moon.

• The surface has many flat plain-like areas and craters.

• It has a very thin atmosphere of sodium and other gases.

• Since it has little atmosphere and is so close to the sun its temperatures range from 450º C to -170º C.

Page 9: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

The evening sky

Page 10: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

Mercury up close

Page 11: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

Mercury, really close

Page 12: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

VENUS• Venus is about the size and in many ways the

same structure as Earth.

• There are, however, many ways in which it differs.

• It takes Venus 7.5 Earth-months to revolve around the sun.

• It takes Venus 8 Earth-months to rotate on its axis. On Venus a day is longer than a year.

• Venus also rotates in a direction that is opposite of all the other planets. That is called retrograde rotation.

Page 13: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

• Venus’ atmosphere is very thick. Every day is cloudy.

• The atmosphere is 90 times greater than ours. If you were on the surface you would be crushed.

• The atmosphere is almost all carbon dioxide with some sulfuric acid as well. A human could not survive.

• The carbon dioxide traps the sun’s energy so the temperature gets up to 460ºC and stays there.

• That is called the greenhouse effect.

• Venus is mostly rock with volcanoes and lava flow.

Page 14: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the
Page 15: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

Venus: shrouded with clouds composed of sulfuric acid

Page 16: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

Radar can see

through the clouds

to the surface of

Venus

Page 17: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

Venus rotates “backward” compared to the other inner planets. Note other differences between the planets’ motions.

Page 18: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

MARS• Mars is called the red planet because it has an

iron oxide surface that is red.

• It has a very thin atmosphere that is mostly carbon dioxide.

• There is some solid water at the north pole of Mars. This is covered with solid carbon dioxide in the winter.

• Mars is tilted on its axis so it has seasons. During the change of seasons many dust storms exist.

• Mars has two very small moons called Phobos and Deimos.

Page 19: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the
Page 20: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the
Page 21: THE INNER PLANETS The four planets that are closest to the sun are called the inner planets. They are all small and rocky. They are sometimes called the

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