Exploring the Solar System: Planets, Moons, and More!

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2. An overview of the Solar System

3. The Sun • The sun is the biggest, brightest, and hottest object in the solar system. • The sun is an ordinary star. • The sun is made of about 70% hydrogen and 28% helium.

4. Mercury • Mercury is solid and is covered with craters. • Mercury has almost no atmosphere. • Mercury is the eighth largest planet.

5. Venus • Venus is the sixth largest planet. It’s about three-fourths the size of earth. • The surface is rocky and very hot. The atmosphere completely hides the surface and traps the heat.

6. Earth • Earth is the fifth largest planet and the third from the sun. • Liquid covers 71 percent of the Earth’s surface. • The Earth has one moon.

7. Moon

8. Mars • Mars is the fourth planet from the sun. • Mars has a thin atmosphere that contains mostly carbon dioxide. • Mars has two small moons.

9. Moons of Mars Phobos Deimos

10. Jupiter

11. Jupiter’s Red Spot • The Great Red Spot, a huge storm of swirling gas that has lasted for hundreds of years. • Jupiter does not have a solid surface. The planet is a ball of liquid surrounded by gas.

12. Moons of Jupiter • Jupiter has four large Galilean moons, twelve smaller named moons and twenty-three more recently discovered but not named moons. • We’ll take a look at the four large Galilean moons which were first observed by Galileo in 1610.

13. Io • Io is the fifth moon of Jupiter. It’s the third largest of Jupiter’s moons. • Io has hundreds of volcanic calderas. Some of the volcanoes are active.

14. Europa • Europa is the sixth of Jupiter’s moons and is the fourth largest. • It is slightly smaller than the Earth’s moon. • The surface strongly resembles images of sea ice on Earth. There may be a liquid water sea under the crust. • Europa is one of the five known moons in the solar system to have an atmosphere.

15. Ganymede • Ganymede is the seventh and largest of Jupiter’s known satellites. • Ganymede has extensive cratering and an icy crust.

16. Callisto • Callisto is the eighth of Jupiter’s known satellites and the second largest. • Callisto has the oldest, most cratered surface of any body yet observed in the solar system.

17. Saturn • Saturn is the second largest planet and the sixth from the sun. • Saturn is made of materials that are lighter than water. If you could fit Saturn in a lake, it would float!

18. Rings of Saturn • Saturn’s rings are not solid; they are composed of small countless particles. • The rings are very thin. Though they’re 250,000km or more in diameter, they’re less than one kilometer thick.

19. Uranus • Uranus is the third largest planet and the seventh from the sun. • Uranus is one of the giant gas planets. • Uranus is blue-green because of the methane in its atmosphere.

20. Neptune • Neptune is the fourth largest planet and the eight from the sun. • Because of the orbits, from 1979 to 1999, Neptune was the ninth planet. • Like Uranus, the methane gives Neptune its color.

21. Pluto • Pluto is the smallest planet and usually the farthest from the sun. • Pluto is the only planet that has not been visited by a spacecraft.

22. Thanks Submitted by Ashtha Kolkatta

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