Cain, Fraser. "Gravity on Uranus." Universetoday.com. Universe Today, 1 Oct. 2008. Web. 06 June 2014. <http://www.universetoday.com/18947/gravity-on-uranus/>.
"Hydrogen Facts." Sciencekids.co.nz. Science Kids, n.d. Web. 06 June 2014. <http://www.sciencekids.co.nz/sciencefacts/chemistry/hydrogen.html>.
"Hydrogen: Use." Webelements.com. Web Elements, n.d. Web. 06 June 2014.
<http://www.webelements.com/hydrogen/uses.html>.
"Uranus." Nasa.gov. N.p., n.d. Web. 06 June 2014.
<http://voyager.jpl.nasa.gov/science/uranus.html>.
"Uranus Facts." Space-facts.com. Space Facts, n.d. Web. 05 June 2014.
<http://space-facts.com/uranus/>.
"Uranus - Introduction." Uranus - Introduction. Astronomy Online, n.d. Web. 06 June 2014. <http://astronomyonline.org/SolarSystem/UranusIntroduction.asp>.
"Uses of Helium." Usesof.net. Uses Of, n.d. Web. 06 June 2014.
<http://www.usesof.net/uses-of-helium.html>.
"Hydrogen Facts." Sciencekids.co.nz. Science Kids, n.d. Web. 06 June 2014. <http://www.sciencekids.co.nz/sciencefacts/chemistry/hydrogen.html>.
"Hydrogen: Use." Webelements.com. Web Elements, n.d. Web. 06 June 2014.
<http://www.webelements.com/hydrogen/uses.html>.
"Uranus." Nasa.gov. N.p., n.d. Web. 06 June 2014.
<http://voyager.jpl.nasa.gov/science/uranus.html>.
"Uranus Facts." Space-facts.com. Space Facts, n.d. Web. 05 June 2014.
<http://space-facts.com/uranus/>.
"Uranus - Introduction." Uranus - Introduction. Astronomy Online, n.d. Web. 06 June 2014. <http://astronomyonline.org/SolarSystem/UranusIntroduction.asp>.
"Uses of Helium." Usesof.net. Uses Of, n.d. Web. 06 June 2014.
<http://www.usesof.net/uses-of-helium.html>.