[j_tull]

Isn't this the planet whose spin axis lies in (as opposed to the more conventional perpendicular to) the ecliptic? I remember reading that this was once offered as evidence that Uranus is a planet captured by Sol's gravity, rather than spun from Sol's mass as the rest supposedly were.

[Irish_Thatcherite]

If that is so, the planet should be orbiting inward to the sun, our moon is orbiting away from us, because (allegedly) it separated from Earth after colossal impact.

[ElkGroveDan]

Yes Uranus has an unusual orientation to it's axis of rotation. It needn't have been captured from outside the solar system though. Things were highly chaotic in the early days of solar system formation. A massive impact with a planetary object could have knocked its axis to its present position. There is definitely some odd behavior in the systems of Uranus and Neptune, including moons with retrograde motion. This is all most likely a sign of one or more large body encounters. It has even been proposed that Neptune and Uranus may have swapped relative orbital positions in the distant past.