Question

uranus is unusual because its axis of rotation is tilted 98° from the perpendicular to its orbital plane. it is mostly made up of methane. it has a retrograde orbit. this is probably because it migrated in from the oort cloud. it formed that way out of the solar nebula. it underwent at least one major impact with another earth - sized solar system body. it was gravitationally captured from another star system.

Explanation:

Uranus is known for its extreme axial tilt of 98° from the perpendicular to its orbital plane. The likely cause of this tilt is a major impact with another large - sized body in the early Solar System. Methane is a component of Uranus but not what makes it most unusual, and it does not have a retrograde orbit. For the cause, migration from the Oort Cloud or gravitational capture from another star system are not likely, and forming that way from the solar nebula is less plausible than a major impact event.

Answer:

First question: its axis of rotation is tilted 98° from the perpendicular to its orbital plane.
Second question: it underwent at least one major impact with another Earth - sized Solar System body.