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Chapter 14: Problem 15

Briefly describe the evidence supporting the idea that Uranus was struck by a large planetlike object several billion years ago.

Short Answer

Expert verified
The evidence supporting the idea that Uranus was struck by a large planetlike object several billion years ago comes from its unique axial tilt of 98 degrees, its irregular magnetic field that's tilted and off-center, and the unusual orbits of its moons, which suggest they may have formed from a debris disk following a giant impact.

Step by step solution

01

Discuss Uranus's axial tilt

Uranus exhibits an unusual axial tilt, where its rotation axis is tilted by a remarkable 98 degrees with respect to its orbit around the sun. This means that it essentially spins on its side. One theory to explain this is that a large planetlike object collided with Uranus, knocking the planet onto its side.
02

Discuss Uranus's magnetic field

Another piece of evidence comes from the study of Uranus's magnetic field. Unlike other planets, Uranus's magnetic field is tilted and does not originate from its geometric center. These irregularities could be the result of a massive impact that significantly altered the planet's internal structure.
03

Discuss the orbits of Uranus鈥檚 moons

Uranus鈥檚 moons also offer clues about its history. The orbits of the moons suggest that they were formed from the debris left after the giant impact. The unusual orbits of some of Uranus's moons could also be explained by this impact, which could have disrupted their original orbits.

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