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How Does Earth Compare With Other Planets?. Mrs. Greer. 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 Earth’s neighboring planets. What We Know About The Earth….
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How Does Earth Compare With Other Planets? Mrs. Greer
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 Earth’s neighboring planets How Does Earth Compare With Other Planets?
All About The Earth… • Earth is the only known planet that has air for you to breathe • Earth has water How Does Earth Compare With Other Planets?
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 How Does Earth Compare With Other Planets?
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 How Does Earth Compare With Other Planets?
Mercury… • Mercury takes 88 days to revolve around the sun • Mercury takes 59 days to rotate on its axis
Mercury… • Mercury is four-tenths the distance of Earth to the sun • Mercury is the 2nd smallest planet—it is half the size of Earth • Mercury has no moons
Venus… • Venus takes 8 months to revolve around the sun • Venus takes 243 days to rotate on its axis
Venus… • Venus is seven-tenths the distance of Earth to the sun • Venus is the 4th smallest planet—almost the same size as Earth • Venus has no moons
Earth… • Earth takes 1 year to revolve around the sun • Earth takes 1 day to rotate on its axis
Earth… • Earth is the middle planet in size • Earth has 1 moon
Mars… • Mars takes 1.9 years to revolve around the sun • Mars takes 25 hours to rotate on its axis
Mars… • Mars is 1.5 times the distance of Earth to the sun • Mars is the 3rd smallest planet—half the size of the Earth • Mars has 2 moons
Jupiter… • Jupiter takes 12 years to revolve around the sun • Jupiter takes 10 hours to rotate on its axis
Jupiter… • Jupiter is 5.2 times the distance of Earth to the sun • Jupiter is the largest planet—11 times the size of Earth • Jupiter has at least 16 moons
Saturn… • Saturn takes 29.5 years to revolve around the sun • Saturn takes about 11 hours to rotate on its axis
Saturn… • Saturn is 9.5 times the distance of Earth to the sun • Saturn is the 2nd largest planet—9 times the size of Earth • Saturn has 18 moons
Uranus… • Uranus takes 84 years to revolve around the sun • Uranus takes 17 hours to rotate on its axis
Uranus… • Uranus is 19.2 times the distance of Earth to the sun • Uranus is the 3rd largest planet—4 times the size of the Earth • Uranus has 17 moons
Neptune… • Neptune takes 165 years to revolve around the sun • Neptune takes more than 16 hours to rotate on its axis
Neptune… • Neptune is 30 times the distance of Earth to the sun • Neptune is the 4th largest planet—4 times the size of the Earth • Neptune has 8 moons
Pluto… • Pluto takes 250 years to revolve around the sun • Pluto takes 6 days to rotate on its axis
Pluto… • Pluto is 40 times the distance of Earth to the sun • Pluto is the smallest planet—smaller than Earth’s moon • Pluto has 1 moon
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 How Does Earth Compare With Other Planets?
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 How Does Earth Compare With Other Planets?
Orbits… • Planets that are closest to the sun are like Earth • Mercury, Venus, and Mars are made up mostly of solid rock How Does Earth Compare With Other Planets?
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 How Does Earth Compare With Other Planets?
Orbits… • You may think that Pluto is farthest from the sun • You are mostly right • Sometimes Neptune is the farthest away How Does Earth Compare With Other Planets?
Orbits… • This is because Pluto’s orbit sometimes crosses Neptune’s orbit • Between 1979 and 1999 Neptune was farthest from the sun How Does Earth Compare With Other Planets?
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 How Does Earth Compare With Other Planets?
What Scientists Know… • Mariner 10 was able to photograph half the sunlit side of Mercury • The pictures revealed that Mercury is similar to Earth’s moon • But, we still know less about Mercury than any other planet except Pluto How Does Earth Compare With Other Planets?
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 How Does Earth Compare With Other Planets?
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 How Does Earth Compare With Other Planets?
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 How Does Earth Compare With Other Planets?
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 How Does Earth Compare With Other Planets?
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 How Does Earth Compare With Other Planets?
