Which planet is known for spinning on its side due to an extreme axial tilt?

Which planet is known for spinning on its side due to an extreme axial tilt?

• A. Uranus
• B. Jupiter
• C. Earth
• D. Neptune

Answer: (A)

An extreme axial tilt makes a planet rotate with its axis nearly in the plane of its orbit around the Sun, so it appears to roll on its side. Uranus has a tilt of about 98 degrees, which means its rotation axis lies almost horizontal to its orbital plane. Because of that, as it spins, its poles point roughly toward and away from the Sun over the course of its year, giving it a very tilted, sideways orientation compared to the other planets. Other giants have much smaller tilts—Jupiter is tilted only a few degrees, Earth about 23.5 degrees, and Neptune around 28 degrees—so they don’t exhibit this sideways rotation. The striking tilt of Uranus is often attributed to a large early collision or strong gravitational interactions during formation, which knocked its axis into that extreme position.

An extreme axial tilt makes a planet rotate with its axis nearly in the plane of its orbit around the Sun, so it appears to roll on its side. Uranus has a tilt of about 98 degrees, which means its rotation axis lies almost horizontal to its orbital plane. Because of that, as it spins, its poles point roughly toward and away from the Sun over the course of its year, giving it a very tilted, sideways orientation compared to the other planets.

Other giants have much smaller tilts—Jupiter is tilted only a few degrees, Earth about 23.5 degrees, and Neptune around 28 degrees—so they don’t exhibit this sideways rotation. The striking tilt of Uranus is often attributed to a large early collision or strong gravitational interactions during formation, which knocked its axis into that extreme position.