Astronomy Practice Exam

What happens to Uranus' rotation compared to most planets in the solar system?

1. It rotates in a normal position

2. It rotates in an upright position

3. It rotates in an abnormal position

4. It has no significant rotation

The correct answer is: It rotates in an abnormal position

Uranus exhibits a unique rotational characteristic that sets it apart from most other planets in the solar system. It rotates on its side, with an axial tilt of approximately 98 degrees relative to its orbit around the Sun. This extreme tilt means that its rotation is effectively horizontal when viewed in relation to the plane of the solar system. This abnormal position results in unusual seasonal changes, with one side of the planet continuously exposed to the Sun for about 42 Earth years, while the other side remains in darkness for the same amount of time. This axial tilt is significantly greater than that of the other major planets, leading to unique atmospheric dynamics as well as unusual weather patterns. In contrast, most planets, including Earth, have a relatively upright rotation which means their axes are aligned closer to perpendicular to their orbital planes, resulting in the more conventional day-night cycle and seasonal changes experienced on those planets. This is not the case for Uranus, making its rotation particularly distinctive within the context of our solar system.