Planet websites

Mercury

http://solarsystem.nasa.gov/planets/mercury/facts
http://solarsystem.nasa.gov/planets/mercury/needtoknow
http://space-facts.com/mercury/
https://theplanets.org/mercury/
http://kids.nineplanets.org/mercury.htm

Venus

http://solarsystem.nasa.gov/planets/venus/facts
http://solarsystem.nasa.gov/planets/venus/needtoknow
http://space-facts.com/venus/
https://theplanets.org/venus/
http://kids.nineplanets.org/venus.htm

Mars

http://solarsystem.nasa.gov/planets/mars/facts
http://solarsystem.nasa.gov/planets/mars/needtoknow
http://space-facts.com/mars/
https://theplanets.org/mars/
http://kids.nineplanets.org/mars.htm
http://www.space.com/20413-phobos-deimos-mars-moons.html

Jupiter

http://solarsystem.nasa.gov/planets/jupiter/facts
http://solarsystem.nasa.gov/planets/jupiter/needtoknow
http://space-facts.com/jupiter/
https://theplanets.org/jupiter/
http://kids.nineplanets.org/jupiter.htm
http://www.space.com/16452-jupiters-moons.html

Saturn

http://solarsystem.nasa.gov/planets/saturn/facts
http://solarsystem.nasa.gov/planets/saturn/needtoknow
http://space-facts.com/saturn/
https://theplanets.org/saturn/
http://kids.nineplanets.org/saturn.htm
http://www.space.com/20812-saturn-moons.html

Uranus

http://solarsystem.nasa.gov/planets/uranus/facts
http://solarsystem.nasa.gov/planets/uranus/needtoknow
http://space-facts.com/uranus/
https://theplanets.org/uranus/
http://kids.nineplanets.org/uranus.htm
http://www.space.com/22201-uranus-moons.html
http://www.space.com/28827-living-on-uranus-moons-titania-miranda.html

Neptune

http://solarsystem.nasa.gov/planets/neptune/facts
http://solarsystem.nasa.gov/planets/neptune/needtoknow
http://space-facts.com/neptune/
https://theplanets.org/neptune/
http://kids.nineplanets.org/neptune.htm
http://www.space.com/21977-neptune-moons-planet-facts-infographic.html
http://www.space.com/22223-triton-moon.html

Moons of the Solar System

http://space-facts.com/moons/
https://solarsystem.nasa.gov/planets/solarsystem/moons
http://www.sciencekids.co.nz/sciencefacts/space/solarsystemmoons.html
http://www.kidsastronomy.com/other_worlds.htm