https://spaceplace.nasa.gov/what-is-gravity/en/ (NASA website)
http://studyjams.scholastic.com/studyjams/jams/science/solar-system/sgravity-and-inertia.htm (Gravity/Inertia Video)
http://www.physics4kids.com/files/motion_gravity.html (info and video)
The Dr. Bincos Show - Gravity Video
Gravity and Orbits Simulation (download it from the site)
http://idahoptv.org/sciencetrek/topics/gravity/games.cfm (cool games)
http://www.sciencekids.co.nz/gamesactivities/detectivescience/gravity.html (games)
http://sciencenetlinks.com/interactives/gravity.html (Gravity Launch Game)
https://testtubegames.com/gravity.html (Gravity Simulator)
https://www.legendsoflearning.com/learning-objectives/gravitational-force/ (games)
Phases of the Moon (Excellent visual that's easy to understand)
Phases of the Moon (info)
Article - What would happen if Earth started to spin faster?
Light and Shadows (info)
Season Simulator (interactive)
Solar/Lunar Eclipses (info)
Eclipses Video (Really good one!)
34 Videos of Solar/Lunar Eclipses (PBS learning)
NASA's 3D App for Solar/Lunar Eclipses (info and videos)
NASA Science Live Website (lots of cool videos)
NASA Solar System Exploration Website (Explore every planet! Interactive and very cool!)
4 Spheres: Biosphere, Atmosphere, Hydrosphere, Geosphere