Origin of the Solar System Our solar system formed 4.6 billion years ago. Would you believe me if I told you it formed from a large cloud of dust and gas? http://www.youtube.com/watch?v=Uhy1fucSRQI
The Nebular Theory Nebular Theory- solar system formed from a rotating cloud of dust and gas. Solar nebula- a large, thin cloud of dust and gas. –Formed from material expelled by previous stars.
The Nebular Theory (A): –Nebula began with slight rotation… –As the cloud contracted, it began to spin faster… –More gravitational attraction between particles (dust)… –Nebula shrinks, accelerating the process.
The Nebular Theory (B): –Solar nebula rotates faster… –Begins to flatten out… –Over 100,000 yrs a protoplanetary disk formed (looks like a giant fried egg)… –The disk was densest in the center and thinner toward the edges.
The Nebular Theory (C): –About 99.9 % of the mass became concentrated at the center (egg yolk)… –This became our sun. At this time our sun was a few million degrees!
The Nebular Theory (D): –Dust grains are colliding… –Weak forces hold them together… –Forming loose balls of dust… –As these balls of dust collided they grew larger… –…formed planetesimals.
The Nebular Theory (D): –Planetesimals (asteroid like bodies that eventually combined to form planets) grew by accretion (process of adding mass by colliding with other planetesimals)…
Protoplanets Once they grew large enough they had a gravitational force… Attracted more material… Became larger… Now protoplanets… Protoplanets formed current planets in a series of violent collisions.
E.Terrestrial Planets Terrestrial planets- Mercury, Venus, Earth and Mars. –Small, and rocky planets. Why aren’t they as large as the gas giants? –Answer- it was too hot near the sun, and much of the material couldn’t condense… –…not until it got farther from the sun.
E. Gas/Ice Giants Ice forming materials (water, ammonia, methane, etc.) condensed farther away from the sun (it’s colder) As these planets grew, gravity increased, and these planets captured Hydrogen (H) and Helium (He) from space…grew even larger!!
14 How many planets do we have in our Solar System? List them. 14 Can you come up with saying to help you remember the order??
Warm-up 4/24/15 1. Describe the Nebular Theory and how our Solar System was formed. 2. List the 8 planets that make up our Solar System. 15
Bellwork 4/27/15 18 On Your Desk: 1.PRIDE Card 2.I.N. 3.Pen/Pencil 1.Which planet is the largest in size? Jupiter is the largest planet. 2. Which planet is the smallest in size? Mercury is the smallest planet. 3. List the rocky planets. Mercury, Venus, Earth and Mars are the 4 rocky planets.
Warm-up 4/28/15 1. How many planets away from the SUN is your planet (or object in the solar system)? 2. How many planets away from the EARTH is your planet (or object in the solar system)? 20 On Your Desk: 1.PRIDE Card 2.I.N. 3.Pen/Pencil
Planet Brochure 21 Day 1: Research *Cite your sources Day 2: Rough Draft Day 3/4: Final Draft **Due Thursday!!!
Warm-up 4/29/15 1. List two amazing things you learned about your planet!! 22 On Your Desk: 1.PRIDE Card 2.I.N. 3.Pen/Pencil 4.Rough Draft
23 SONGS!!! Planets Around a Star: http://www.cleanvideosearch. com/media/action/yt/watch?v =nQfJ7j2UGGk Planets Song: http://www.cleanvideosearch. com/media/action/yt/watch?v =GH61v4_eVNA http://www.cleanvideosearch. com/media/action/yt/watch?v =GH61v4_eVNA
24 Use Chapter 4: Section 5 to discover the differences! -Create “Flip” Cards for each vocabulary term
Measurements Light Year: distance that light travels in a year –Used for measurements within our galaxy –5.88 trillion miles in a year 1 light year equals 63,000 AU AU: Astronomical Unit –Used for measurements within our solar system –Distance from Earth to Sun 1 AU equals 93,000,000 miles
Inner solar system… Consists of: –Sun –Mercury –Venus –Earth Moon –Mars –Asteroid belt Ceres –Other debris Asteroids
Sun Contains 99.8% of all the mass of the solar system Only star in our solar system 865,000 miles in diameter
Mercury Closest planet to the sun The smallest of the 8 planets 2 nd hottest planet Very rocky… like Earth No stable atmosphere