Uranus and Neptune

Uranus and Neptune owe their blue color to a higher concentration of methane gas, as compared to Jupiter and Saturn. They hold some mysteries for us to unravel. For example, Uranus lies on its side as it orbits the sun. Both planets have magnetic fields that are oriented at large angles from their axes of rotation, and do not appear to be centered in the innermost regions of the planets. These gas giants also have large numbers of moons. Perhaps the most intriguing of these moons is Neptune's moon, Triton, with its mountains of water ice.