"Solar System 101, National Geographics" You Tube
"How to Remember the Order of the Planets" You Tube
"Solar System, Blues Clues Song" Nick Jr
"Planet Size Comparison" You Tube
"Planet Size and Order" timeand date.com
"Planet Distance, Bill Nye" You Tube
"Outer Space: We are the Planets, StoryBots" You Tube
"Solar System Picture" Google Images
"To Scale: The Solar System" You Tube
*"The Solar System Test" softschools.com
"Interactive Tour of the Solar System" nineplanets.org
"Star Size Comparison 2" You Tube
"How Big is the Solar System?" It's Okay To Be Smart
"Scale of Universe" scaleofuniverse.com
"Solar System Exploration" NASA
"Solar System" nineplanets.org
"Solar System facts Cartoon" makemegenius.com "Dwarf Planets Gallery" NASA
"Ceres Dwarf Planet with water" NASA
"Your age on other planets." Exploratorium Edu
"Size and Scale" co-intelligence
"Kuiper Belt and Oort Cloud" NASA
"Robotic Exploration Timeline, at the bottom" NASA
"Planet Nine, May Have Been Discovered" CNN