Life

    Miranda doesn't have liquid water. But it does have ice water because of with the low density body likely containing silicate rock and organic compounds in its interior. Miranda has no detectable atmosphere and no magnetic field. Miranda doesn't have an oxygen atmospthere, it is near Uranus and it is also a moon. I personally don't think that there is is life on Miranda. Uranus is the 7th planet from the sun, and Miranda is a moon of it, so there is probally not. 

   Europa is a moon of Jupiter. Jupiter is the 5th planet from the sun. Scientists think there is life on Europa. Since there is liquid water underneath the ice water, there might be life on Europa. I think there might be too. Since water formed humans, and humans need water to survive, then there might as well be life on Europa.

Space Travel

     Astronomical Unit (AU), Kilometers (Km) and Light years (Ly) are 3 differnt ways that you can measure space travel. AU is the distance between the sun and the earth. Kilometers measures the distance between each planet. 
 How long it would take to get to Uranus from Earth would depend on the path chosen and on where Uranus and Earth were in their orbits when the mission was launched. For example, the Voyager 2 spacecraft was launched on Aug 20, 1977 and it reached Uranus on Jan 24 1986. So, Voyager 2 took almost nine and a half years to reach Uranus.
     I think that people can land on Uranus, but who ever wants to, they can spend 9 years in a space shuttle, just to prove that man CAN walk on Uranus.