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Conceptual Formation of the Solar System Basic Ingredients: Cloud of Dust and Gas Exploding Star http://www.saskschools.ca/~gregory/space/sp/nebula.jpg http://currents.ucsc.edu/04-05/06-06/star.asp Step 1 Exploding star (or some other disturbance caused gas and dust to squeeze together Squeezing allows gravity to pull dust and gas closer together Step 2 Cloud begins to spin as it collapses http://www.bsharp.org/physics/stuff/sspin2.avi Step 3 Cloud grows hotter and denser in center, with a disk of gas and dust surrounding the core Disk gets cooler and thinner as you move away from the center Step 4 Dust and gas began to stick together and form clumps Clumps eventually form into planets Step 5 Near center, where it was hot, only rocky or metal material could stand great heat Increasing Heat Decreasing Heat Icy matter settled in the outer region of the disk Scientific Speak: Formation of the Solar System Nebula – Cloud of dust or gas in space Theory: The sun and planets formed from a rotating disk of dust and gases Nebular Theory See Steps 1 & 2 http://www.saskschools.ca/~gregory/space/sp/nebula.jpg http://archives.cnn.com/2001/TECH/space/02/01/hubble.ant.nebula/large.ant.nebula.jpg Protoplanetary Disk Disk of gas and dust surrounding the newly forming star (see Step 3) http://www.hubblespacephotos.com/pics/0113wc.jpg http://www.nmm.ac.uk/upload/img_400/Sun-protoplanetary-disk.jpg Planetesimals Planetesimals are small, irregularly shaped bodies formed by colliding matter (see Steps 4 & 5). http://www.ecology.com/origins-of-life/earths-beginnings/images/3.jpg Summary of the Formation of the Solar System