AIM: What is the Solar System? Do Now: Do Now: What major characteristic must a planet have in order to be part of our solar system?

I. The Sun largest mass in the solar system. all objects revolve around the sun. light takes 8 min to travel to Earth. Fusion powers the sun by turning Hydrogen into Helium which releases large amounts of Energy. Hydrogen

II. Planets How are they different? What are they made of? Size and Solar System Position are the most obvious differences. Terrestrial – small and rocky Jovian – large and mostly gas What are they made of?

Mercury: Earth: Venus: Mars: Terrestrial Planets (Earth-like): inner most planet greatest temperature extremes of any planet Earth: intelligent life forms? only known planet with flowing water Venus: covered by thick clouds can be seen in night sky known as Earth’s sister planet due to similar size Mars: can be commonly seen from Earth known as the Red Planet possibilities of water on Mars, or once on Mars (drainage patterns in crust, evaporate minerals)

Jupiter: Neptune: Uranus: Saturn: Jovian Planets: Cirrus clouds visible in atmosphere 13 known moons, Triton being the largest Dark spot is thought to be a storm Uranus: rotation is parallel to its orbit, not tilted this makes it appear to roll instead of spin Saturn: Prominent features include the Rings of Saturn Has 31 orbiting moons Titan is its largest moon Jupiter: Red Spot is a giant cyclonic storm. Bands are multi colored clouds 28 known moons ( IO, Europa, Ganymede and Callisto are the four largest moons)

Why would Earth show little evidence of Meteor impacts (craters)? III. Other Solar System Objects Comets: pieces of rock held together by frozen gasses. Tail always points away from the sun. Most eccentric orbits. Asteroids and Meteoroids: found in an orbit between Mars and Jupiter, these rocks can be as big as 1000 Km and as small as a grain of sand. Why would Earth show little evidence of Meteor impacts (craters)? Meteorite: are meteoroids that reach Earth’s surface. Their impact creates a crater.

Pluto Do not Copy The debate came to a head in 2006 with an IAU resolution that created an official definition for the term "planet". According to this resolution, there are three main conditions for an object to be considered a 'planet': The object must be in orbit around the Sun. The object must be massive enough to be a sphere by its own gravitational force. More specifically, its own gravity should pull it into a shape of hydrostatic equilibrium. It must have cleared the neighborhood around its orbit.[97] Pluto fails to meet the third condition, since its mass was only 0.07 times that of the mass of the other objects in its orbit. The IAU further resolved that Pluto be classified in the simultaneously created dwarf planet category, and that it act as prototype for a yet-to-be-named category of trans-Neptunian objects

Take the worksheet from the back bottom bin. Closure 1: Take the worksheet from the back bottom bin. Answers: 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) 14) 15) 16) 17) 18) 19) 20) 21) 22) 23) 24) 25) 3 4 2 1 2 3 2 x 4 3 2 3 1 2 2 4 4 2 4 1 1 2 .250 the planet is more eccentric because it is closer to 1 Saturn