The Solar System Sun, Moon and Stars… In the Old Days…

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Presentation transcript:

The Solar System Sun, Moon and Stars… In the Old Days… Appear to rise in East Move at 15o per hour Appear to set in West In the Old Days… Earth was in the center Celestial objects revolved around Earth This was called the GEOCENTRIC MODEL

Geocentric Model Celestial bodies revolve around Earth Epicycles Moon is closest Planets move in small circles called epicycles Epicycles Observations raised doubt about this model… And it was gradually Replaced with a new idea!

Heliocentric Model Planets revolve around the SUN This model explains Mercury is closest Planets move in elliptical orbits -Moon revolves around Earth This model explains all motions of celestial Bodies! Don’t Forget: The Solar System is 4.6 billion years old!

The Inner Planets… Small, dense, made of rock

The Outer Planets… Large, low density, made of gas

Sun and 8 planets (plus Pluto) and other stuff Solar System… Sun and 8 planets (plus Pluto) and other stuff The Sun is a “medium” sized yellow star The Sun contains > 99% of solar system mass

“I’m sorry Pluto, you’re just not big enough”

“Planet Gossip!!”

Sun with Other Yellow Stars… Sun is really not that big!

Sun with Red Giant Stars… Sun is pretty darn small!

WAY OUT in the Solar System Asteroid belt located between Mars and Jupiter The Kuiper Belt is out past Neptune… source of comets Farther out is the Oort cloud

Asteroids! Large Rocks too small to be planets Can be up to 1000km wide! Mostly in the Belt between Mars and Jupiter

Comets! Dirty Ice Balls Really LONG ORBITS Very Eccentric Orbits Come from the Kuiper Belt/Oort clooud Comet Hale-Bopp, 1997

Meteors! Streak of light from a meteoroid going through Earth’s atmosphere Meteoroid is a boulder sized rock in space Meteorite is left over rock that hits Earth

Beyond the Solar System…GALAXIES Billions of stars! Home: The Milky Way Contain other solar systems too! Come in spiral, ring, and sombrero shapes

Beyond the Solar System…UNIVERSE Lots of SPACE Billions of GALAXIES EVERYTHING there IS! In order from smallest to largest… Planet (smallest) Star Solar System (one star, several planets) Galaxy (many solar systems and stars) Universe!