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Name the planets as they go around the sun.

Objects in Our Solar System. Name the planets as they go around the sun. Essential Vocabulary. Rotation – the time it takes to spin on its axis This makes one DAY Revolution – the time it takes to orbit the sun once This makes one YEAR. The Inner Planets.

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Name the planets as they go around the sun.

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  1. Objects in Our Solar System Name the planets as they go around the sun.

  2. Essential Vocabulary • Rotation – the time it takes to spin on its axis • This makes one DAY • Revolution – the time it takes to orbit the sun once • This makes one YEAR

  3. The Inner Planets • Mercury, Venus, Earth and Mars • Known as terrestrial planets because they are made of rock • Revolve around the Sun and rotate on their axis • Closest planets to the Sun

  4. The Outer Planets • Jupiter, Saturn, Uranus, and Neptune • Gas Giants – composed mostly of Hydrogen and Helium • All have rings • Revolve around the sun and rotate on their axis.

  5. The Relative Sizes of the Planets and the Sun NOT TO SCALE!

  6. Largest thing in our solar system 99.8% of the mass of the solar system No solid surface 75% Hydrogen and 25% Helium Rotates on its axis every 25 – 38 days Located in the center of the solar system The SunA ball of glowing gas!

  7. The Moon • Our moon is named Luna • Spherical • About 2400 miles across. • All moons are made of rock. • Moons orbit their planets in the same direction as the planets’ rotations

  8. Galilean Moons • The largest of the many moons of Jupiter • Discovered by Galileo Galilei on Jan. 7, 1610

  9. Galilean Moons Among the most massive rocky objects in the Solar System, with a radius larger than Mercury or any of the dwarf planets.

  10. Galilean Moons Io(3,642 km) With over 400 active volcanoes, Io is the most geologically active object in the Solar System. Europa(3121.6 km) The smooth surface includes a layer of ice, while the bottom of the ice is theorized to be liquid water. Ganymede(5262 km) largest natural satellite in the Solar System, a salt-water ocean is believed to exist nearly 200km below Ganymede's surface, sandwiched between layers of ice. It has a thin oxygen atmosphere. Callisto(4820 km) Callisto is is surrounded by an extremely thin atmosphere composed of carbon dioxide and probably molecular oxygen. Investigation revealed that Callisto may have possibly a subsurface ocean of liquid water at depths greater than 100 kilometers.

  11. Meteoroids • Meteors are rocky fragments of comets, planets, moons, or asteroids. • Travel through space without an orbit.

  12. Meteors • Meteoroids that have entered an atmosphere • Friction with the molecules in the atmosphere cause it to burn • Commonly called “shooting stars”

  13. Meteorites • Any part of a meteoroid that survives passage through the atmosphere andlands on the surface of a planet or a moon. Largest meteorite found on Earth Hoba, Namibia

  14. Comets • Mixture of ices (both water and frozen gases) dust, and rocks • Have an elliptical orbit around the sun • When they are in the inner solar system the radiation from the sun causes a tail to form. • Due to solar winds, the tail always points away from the sun

  15. Asteroids • Left over materials from the formation of the Solar System • Composed of rock or metal • Smaller than a planet but larger than a meteor • No evidence of an atmosphere

  16. Asteroid Belt • Most are located in the asteroid belt between Mars and Jupiter: 2 – 4 AU • probably more than a million

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