Why Are the Inner and Outer Planets Different?

The planets in our solar system have a very specific order. But have you wondered why they have the order they do?

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Sources:
Possible images:
Protoplanetary disks: https://en.wikipedia.org/wiki/Protoplanetary_disk#/media/File:HL_Tau_protoplanetary_disk.jpg
https://en.wikipedia.org/wiki/Protoplanetary_disk#/media/File:Boulevard_of_Broken_Rings.jpg
https://en.wikipedia.org/wiki/Fomalhaut#/media/File:Fomalhaut_B_entire-Hubble_Telescope.jpg
A young star: https://en.wikipedia.org/wiki/Protostar#/media/File:A_diamond_in_the_dust.jpg
Earth water comparison: http://water.usgs.gov/edu/earthhowmuch.html

Sources:
http://atropos.as.arizona.edu/aiz/teaching/nats102/mario/solar_system.html
http://lasp.colorado.edu/education/outerplanets/solsys_planets.php#overview
http://lasp.colorado.edu/~bagenal/1010/SESSIONS/11.Formation.html
http://iopscience.iop.org/article/10.1088/0004-637X/806/2/203/pdf
https://arxiv.org/pdf/1207.4284v1.pdf
http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html
http://www.rsc.org/periodic-table

Видео Why Are the Inner and Outer Planets Different? канала SciShow Space