“Intro to the Solar System” I. How did the solar system form? A. First, the sun formed from its nebula. 1. Refer to nebular theory and for more details. B. All material from the nebula was not drawn into the sun. 1. Left over material collided together making larger objects.. 2. These objects became the planets. 3. Everything else became dwarf planets, moons, comets, asteroids, & meteoroids.

C. Two Types of Planets Formed. 1. One type is called the inner planets. (Terrestrial) 1. One type is called the inner planets. (Terrestrial) 2. Inner planets- The solid iron core, close to the sun, rocky planets. Planets Mercury, Venus, Earth, and Mars are classified as inner planets. 2. Inner planets- The solid iron core, close to the sun, rocky planets. Planets Mercury, Venus, Earth, and Mars are classified as inner planets.

3. The other type is called the outer planets. (Jovian)3. The other type is called the outer planets. (Jovian) 4. Outer Planets- The light gas planets, furthest away from the sun. Jupiter, Saturn, Uranus, & Neptune are classified as outer planets.4. Outer Planets- The light gas planets, furthest away from the sun. Jupiter, Saturn, Uranus, & Neptune are classified as outer planets. 5. All planets orbit the Sun in an elliptical orbit. (Ellipse is the shape. Egg)5. All planets orbit the Sun in an elliptical orbit. (Ellipse is the shape. Egg)

“The Inner Planets” A. Mercury- A. Mercury- The closest planet to the sun 1. Looks like earth’s moon. 2. Craters and cliffs are Mercury’s dominant feature. 3. smallest. 4. No atmosphere. 5. Temperatures get as high as 450 degrees Celsius during the day, and fall to -185 degrees Celsius at night. 6. Named after the Roman Messenger God. 7. One day = 59 earth days, one year = 88 earth days.

VenusB. Venus: “Earth’s Sister Planet” 1. The hottest planet in the solar system. 2. Temperatures stay constant around 480 degrees C. (900 degrees F) 3. Its thick CO2 atmosphere causes the high temperatures. 4. CO2 in the Venus’ atmosphere causes the “Green House Effect”. A.) Radiation from the sun enters Venus’ atmosphere and is absorbed by the ground. B.) The radiation turns into heat or Infrared radiation. C.) Heat then tries to escape from the planet. (CO2 traps all of the heat trying to escape) D.) The planet keeps getting warmer & warmer. E.) Almost the same way a green house stays warm.

Venus Continued: 5. Venus rotates clockwise. 6. Named after the Roman Goddess of Love and Beauty. 7. One day = 243 earth days, One year = 225 earth days.

C. Earth: “Our Planet” 1. The only planet that can support human life. 2. Only planet that has all states of H2O on it. A.) Solid = Ice B.) Liquid = Water C.) Gas = Water Vapor 3. Has one moon. 4. The only planet with live plate tectonics. 5. Larger than three planets and smaller than four planets. 6. One Day = 24 hours, One Year = days.

D. Mars: “The Red Planet” 1. Mars looks red because its surface soil has iron in it. 2. When iron reacts with O2 you get rust. 3. The largest volcano in the solar system exists on Mars. ( Olympus Mons ) 4. Named after the Roman God of War. 5. Mars has two moons revolving around it. A.) Phobos - Larger moon. B.) Deimos - Smaller moon. 6. One Day = 24.6 hours, One year = 687 earth days.

“The Outer Planets” I. Outer Planets: A. Jupiter: “The Largest Planet” 1. Patterns of colorful clouds are Jupiter’s dominant feature. Lightning storms continually occur. (The Great Red Spot is the most spectacular.) 2. Under the clouds, scientists think, lies a huge ocean of liquid hydrogen. 3. Under the ocean there is a core of solid hydrogen. 4. Jupiter has 63 moons.

5. The Galilean Moons, the four largest moons, are named after Galileo. He discovered them with his first telescope. A.) Ganymede: * 2nd largest of Jupiter’s moons. * Larger than Mercury. B.) Callisto: * The Largest moon in the solar system. C.) Io: * Most famous moon of Jupiter * Active volcanoes cover the surface. * Red & Yellow sulfur erupts 180 miles high into Io’s sky.

“Jupiter Continued” 6. Jupiter is named after the Roman King of the Gods. D.) Europa: * Scientists and science fiction artists have speculated that if it is true there may be forms of life in this water!. * Under the ice may be some liquid water. * Covered by a thick layer of H2O ice. 7. Has a dark narrow ring system. 8. One day = 9hours, 51 minutes, One year = 11.9 years.

B. Saturn: “The Ringed Planet” 1. 2nd largest planet. 2. Has a large ring system going around the planet. A.) What is a ring? * They are made of small pieces of ice and rock. * They are not solid. B.) How did they form? * Scientists believe that moons of Saturn may have wondered to close to it.

* Then Saturn’s gravity pulled the moon apart. * Roche Limit - The distance away from the planet a moon must be before being torn apart. * All of Saturn’s rings are inside this limit.. 3. Has a very low density. (Would float on water.) 4. Has 56 moons. 5. Titan: Largest moon of Saturn. (2nd largest IN SOLAR SYSTEM) A.) larger than Mercury. B.) Its atmosphere resembles Earth’s. Made mostly of Nitrogen. C.) Has very large oceans of liquid methane.

6. One day = 10hours & 40 minutes, One year = 29.5 years. 7. Named after Jupiter’s Father & The Roman God of Agriculture.

C. Uranus: “The Sideways Planet” 1. Uranus was plotted on a star chart at one time. 2. Made mostly of Helium and Methane. (these gases give the planet its blue-green color.) 3. Spins on its side. (Possibly struck by another object and flipped on its side.) 4. Has a very small, dark ring system. 5. Has 27 moons. 6. 3rd largest planet 7. Named after the father of Saturn & The Earliest Supreme God. 8. One day = 17.2 hours, One year = 84 years.

D. Neptune: “The Blue Planet” 1. Last of the gas giant planets. 2. Made mostly of Hydrogen, Helium, Methane. (This gas gives the planet its blue color.) 3. Has a very small, dark ring system. 4. Has 13 moons. 5. Triton is its largest moon. * Triton has the coldest surface temperature in the solar system. (-435 degrees F or -260 degrees C.) * Has active geysers spewing out liquid methane and H2O Ice. 6. Named after the Roman God of the Sea. 7. 4th largest planet. 8. One day = 16.1 hours, One year = 164 years.

II. Planets, Dwarf Planets, & Small Solar System Bodies: A. “Planet”- is a celestial body that: (a) is in orbit around the sun. (b) has sufficient mass for its self-gravity to shape it into a nearly round shape. (c) has cleared the neighborhood around its orbit of all objects. (d) There are 8 of these objects recognized. B. “dwarf planet”- is a celestial body that: (a) has all the characteristics above except the one below. (b) Has not cleared the neighborhood around it’s orbit of all objects

(d) There are 3 of these objects recognized. * Pluto (God of the Underworld), Eris (Goddess of Chaos & Discord), & Ceres (Goddess of Plants). * All Kuiper Belt objects will eventually join this status. * Kuiper Belt- a band of icy debris that is in orbit around the sun, outside of Neptunes orbit. C. “Small Solar System Bodies”- All other objects except satellites orbiting the sun.

ORBITAL PLANES

“Comets, Meteoroids, & Asteroids” I.. Comets: 2. Where do comets come from? 1. Comet -Is composed of dust and rock particles mixed with H2O, Methane and Ammonia.

Oort CloudA.) Oort Cloud -Large collection of comets, that lies in a cloud, completely surrounding the solar system. B.) This cloud orbits the sun beyond the orbit of Pluto. 3. How do comets break away???? *PULLED OUT by a planet (Jovian) *BUMPED OUT by another in the OORT CLOUD

II. Structure of Comets: 1. A comet starts off as a round ball of dust and rock mixed with frozen water methane ammonia. A.) This is the comets nucleus. 2. As it travels closer to the sun the water, methane and ammonia starts to melt. 3. A cloud of gases form around the ball. A.) This is the comet’s Coma. 4. The sun then pushes the coma in the opposite direction. A.) This forms the comet’s tail. B.) As the tail forms, pieces of the comet break away and drift off into space..

5. As the comet is heading away from the sun it will eventually freeze up into a simple nucleus again. 6. After many trips around the sun the comet will eventually die. III. Asteroids, Meteoroids, Meteors, & Meteorites: 1. Asteroids -A piece of rock that is similar to the material that formed our planets. A.) Most are located between the orbits of Mars and Jupiter. B.) This area is called the asteroid belt. C.) Asteroids range in size from small dust like particles to large rocks km wide. D.) Ceres is the largest asteroid ever found. (940km wide)

2. Meteoroids - Small pieces of rock that travel through space. A.) Most are found to be pieces of a comet that broke away during its orbit around the sun, or the result of an asteroid collision.

B.) When a meteoroid passes through the path of the earth’s atmosphere it is then referred to as a meteor. 3. Meteor- A meteoroid that burns up in the earth’s atmosphere. 4. Meteorite- A meteoroid so large that it does not burn up the entire way and strikes earth’s surface.

Impact Crater