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The Solar System

The Solar System. A Fifth Grade Science. Introduction. A solar system consists of a star and objects that revolve around it. Our Solar System consists of the Sun and nine known planets and the moons that orbit those planets. The force of gravity keeps planets in orbit around the sun. The Sun.

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The Solar System

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  1. The Solar System A Fifth Grade Science

  2. Introduction • A solar system consists of a star and objects that revolve around it. • Our Solar System consists of the Sun and nine known planets and the moons that orbit those planets. • The force of gravity keeps planets in orbit around the sun.

  3. The Sun • It is over one million times larger than Earth. • It is eight light minutes away from Earth or 92,957,000 miles. • The temperature is 15 million degrees K. One K = 13-25 million degrees!

  4. Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune The Eight Known PlanetsThe Inner PlanetsThe Outer Planets

  5. Mercury • Closest planet to the sun • Approximately half the size of Earth • Rocky surface covered by craters • No water or air results in unchanged appearance • Surface temperatures are hot enough to melt lead

  6. Uranus • Seventh planet from the Sun • Four times larger in diameter than the Earth • Blue-green in color • The tilt of the axis causes sunlight for 42 years at a time

  7. Venus • Second planet from the Sun • Approximately the same size as the Earth • Atmosphere consists of poisonous gases

  8. Earth • Third planet from the Sun • Largest of the four inner planets • Only planet where life is known to exist • 70% of the surface is covered by water

  9. Mars • Fourth planet from the Sun • Approximately half the size of Earth • Known as the Red Planet • Has four seasons similar to Earth • Resembles Earth more than any other planet

  10. Jupiter • Fifth planet form the Sun • Largest planet in our Solar System • 1300 Earths could fit inside Jupiter • Doesn’t have a surface; made of gases

  11. Saturn • Sixth planet from the Sun • Second largest planet • 800 Earths could fit inside Saturn • Thousands of rings are made up of ice and rock fragments

  12. Neptune • Eighth planet form the Sun • Four times larger in diameter than the Earth • Blue in color

  13. Pluto • Is now known as a “dwarf” planet • Coldest planet • Unusual orbit caused it to be the 8th planet from 1979 - 1999!

  14. Let’s compare the planets to Earth

  15. A day on : Mercury = 3 Earth months Venus = 117 Earth days Mars = 41 minutes longer than an Earth day Jupiter = 10 Earth hours Saturn = 10 ½ Earth hours Uranus = 13 ½ Earth hours Neptune = 18 Earth hours Pluto = 7 Earth days

  16. If you weigh 85 lbs. On Earth, you weigh: • 32 lbs on Mercury • 77 lbs on Venus • 32 lbs on Mars • 244 lbs on Jupiter • 112 lbs on Saturn • 79 lbs on Uranus • 105 lbs on Neptune • 2.5 lbs on Pluto

  17. The Orbital Speed of the Planets • Mercury = 30 miles per second • Venus = 22 miles per second • Earth = 19 miles per second • Mars = 15 miles per second • Jupiter = 8 miles per second • Saturn = 6 miles per second • Uranus = 4.2 miles per second • Neptune = 3.3 miles per second • Pluto = 2.9 miles per second Therefore, the further away from the Sun, the slower the orbital speed.

  18. The Earth has one Moon.How many moons do the other planets have? • Mercury - 0 • Venus - 0 • Mars - 2 • Jupiter - 17 • Saturn - 22 • Uranus - 15 • Neptune - 2 • Pluto - 1 • The Moon

  19. It takes 365 days for Earth to revolve around the Sun. How long does it take the other planets? • Mercury - 88 Earth days • Venus - 225 Earth days • Mars - about 2 Earth years • Jupiter - 11.8 Earth years • Saturn - 30 Earth years • Uranus - 84 Earth years • Neptune - 165 Earth years • Pluto - 248 Earth years

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