How Does Earth Compare With Other Planets?

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How Does Earth Compare With Other Planets?

• Mrs. Greer

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Objectives

• Learn how the Earth is similar to and different
  from other planets
• Learn what the orbits of the planets are like
• Learn what scientists have learned about Earths
  neighboring planets

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What We Know About The Earth
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All About The Earth

• Earth is the only known planet that has air for
  you to breathe
• Earth has water

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All About The Earth

• Earth has all of the resources you and other
  living things need
• Earth is the only planet in our solar system that
  can support the kind of life found on Earth

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Similarities With Other Planets
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Similarities

• All of the nine planets are satellites of the sun
• The planets, their moons, and the sun make up
  most of our solar system
• None of the planets make light, they all reflect
  light from the sun

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Differences With Other Planets
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Mercury

• Mercury takes 88 days to revolve around the sun
• Mercury takes 59 days to rotate on its axis

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Mercury

• Mercury is four-tenths the distance of Earth to
  the sun
• Mercury is the 2nd smallest planetit is half the
  size of Earth
• Mercury has no moons

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Venus

• Venus takes 8 months to revolve around the sun
• Venus takes 243 days to rotate on its axis

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Venus

• Venus is seven-tenths the distance of Earth to
  the sun
• Venus is the 4th smallest planetalmost the same
  size as Earth
• Venus has no moons

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Earth

• Earth takes 1 year to revolve around the sun
• Earth takes 1 day to rotate on its axis

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Earth

• Earth is the middle planet in size
• Earth has 1 moon

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Mars

• Mars takes 1.9 years to revolve around the sun
• Mars takes 25 hours to rotate on its axis

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Mars

• Mars is 1.5 times the distance of Earth to the
  sun
• Mars is the 3rd smallest planethalf the size of
  the Earth
• Mars has 2 moons

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Jupiter

• Jupiter takes 12 years to revolve around the sun
• Jupiter takes 10 hours to rotate on its axis

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Jupiter

• Jupiter is 5.2 times the distance of Earth to the
  sun
• Jupiter is the largest planet11 times the size
  of Earth
• Jupiter has at least 16 moons

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Saturn

• Saturn takes 29.5 years to revolve around the sun
• Saturn takes about 11 hours to rotate on its axis

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Saturn

• Saturn is 9.5 times the distance of Earth to the
  sun
• Saturn is the 2nd largest planet9 times the size
  of Earth
• Saturn has 18 moons

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Uranus

• Uranus takes 84 years to revolve around the sun
• Uranus takes 17 hours to rotate on its axis

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Uranus

• Uranus is 19.2 times the distance of Earth to the
  sun
• Uranus is the 3rd largest planet4 times the size
  of the Earth
• Uranus has 17 moons

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Neptune

• Neptune takes 165 years to revolve around the sun
• Neptune takes more than 16 hours to rotate on its
  axis

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Neptune

• Neptune is 30 times the distance of Earth to the
  sun
• Neptune is the 4th largest planet4 times the
  size of the Earth
• Neptune has 8 moons

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Pluto

• Pluto takes 250 years to revolve around the sun
• Pluto takes 6 days to rotate on its axis

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Pluto

• Pluto is 40 times the distance of Earth to the
  sun
• Pluto is the smallest planetsmaller than Earths
  moon
• Pluto has 1 moon

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Orbits Of The Planets
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Orbits

• Orbits keep the planets moving around the sun
• The orbits of planets are really ellipses
• Ellipses are circles that have been flattened a
  little

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Orbits

• The farther planets are from the sun, the longer
  their orbits are
• The farther a planet is from the sun, the longer
  it takes for it to make one revolution around the
  sun and they have longer years

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Orbits

• Planets that are closest to the sun are like
  Earth
• Mercury, Venus, and Mars are made up mostly of
  solid rock

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Orbits

• Planets that are farther away from the sun are
  unlike Earth
• Jupiter, Saturn, Uranus, and Neptune are made up
  of mostly gas and may be solid in the center
• Pluto is a little different than any other
  planet, because it is made up of rock and ice

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Orbits

• You may think that Pluto is farthest from the sun
• You are mostly right
• Sometimes Neptune is the farthest away

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Orbits

• This is because Plutos orbit sometimes crosses
  Neptunes orbit
• Between 1979 and 1999 Neptune was farthest from
  the sun

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What Scientists Know About Earths Neighboring
Planets
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What Scientists Know

• Before the 1970s, people on Earth knew very
  little about the other planets
• Mercury was hard because it is so close to the
  sun
• In 1974, the spacecraft Mariner 10 was sent to
  Mercury

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What Scientists Know

• Mariner 10 was able to photograph half the sunlit
  side of Mercury
• The pictures revealed that Mercury is similar to
  Earths moon
• But, we still know less about Mercury than any
  other planet except Pluto

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What Scientists Know

• Venus is covered by thick clouds of gas
• These clouds keep scientists from seeing the
  surface of Venus
• Then in 1978, the Venus orbiter Pioneer was able
  to take pictures

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What Scientists Know

• The pictures showed hilly plains, highlands,
  large volcano-like mountains, and flat lowlands
• Later Venus was studies by Magellan spacecraft
• It reached Venus on August 10, 1999

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What Scientists Know

• It found that the surface of Venus is mostly
  covered by rocks and ash from volcanoes
• The surface did not show wind erosion
• Vikings 1 and 2 were the spacecrafts sent to Mars

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What Scientists Know

• They did not find evidence of life like they were
  expecting
• But they did find tiny amounts of water vapor
• 21 years later, the spacecraft Pathfinder landed
  on Mars
• There were new findings

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What Scientists Know

• The new findings gave more evidence that Mars was
  once a warmer, wetter planet
• What scientists thought to be old river beds may
  have been filled with flowing water at one time

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The End