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Are there any exceptions to the rule that planets rotate with small axis tilts and in the same direction as they orbit the Sun? (a) No (b) Venus is the only exception. (c) Venus and Uranus are exceptions.

Short Answer

Expert verified
(c) Venus and Uranus are exceptions.

Step by step solution

01

Analyze the Problem

The problem asks us to identify any exceptions to the general rule about planetary rotation. Specifically, it focuses on whether planets rotate with small axis tilts and in the same direction as they orbit the Sun.
02

Review the General Rule

In our Solar System, most planets rotate with a small axis tilt and in the same direction as they orbit the Sun. This movement is known as prograde rotation, where the axis tilt is relatively close to 0 degrees.
03

Examine Venus's Characteristics

Venus has an axial tilt of about 177 degrees, which means it rotates in the opposite direction (retrograde rotation) compared to most planets. This makes Venus an exception to the rule.
04

Examine Uranus's Characteristics

Uranus has an axial tilt of about 98 degrees, which lies nearly on its side relative to its orbit. Its rotation direction is also considered retrograde. Thus, Uranus is another exception to the general rule.
05

Conclude the Exceptions

Both Venus and Uranus deviate from the usual prograde rotation with small axis tilts observed in other planets, making them exceptions to the rule.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Axial Tilt
Axial tilt, also known as obliquity, is the angle between a planet's rotational axis and its orbital plane. This tilt can vary widely among the planets in our Solar System.
A planet with a small axial tilt rotates with its axis almost perpendicular to its orbital path. Earth, for instance, has an axial tilt of about 23.5 degrees, which leads to the changing seasons as the planet orbits the Sun.
However, not all planets adhere to a small tilt. For example, Venus has an axial tilt of roughly 177 degrees, making it almost completely upside down relative to its rotation, while Uranus's axial tilt is about 98 degrees, causing it to rotate almost on its side.
Prograde Rotation
Prograde rotation refers to a planet rotating in the same direction as it orbits the Sun. This is the rotation pattern observed in most of the planets in our Solar System.
When a planet exhibits prograde rotation, it spins from west to east, which is also how the Earth rotates. The Sun rises in the east and sets in the west due to this prograde spin.
However, some planets deviate from this pattern, which is not common among the major planets. Prograde rotation generally aligns with a small axial tilt, facilitating a harmonious rotational and orbital motion.
Retrograde Rotation
Retrograde rotation occurs when a planet rotates in the opposite direction to its orbit around the Sun. This unusual pattern can result in phenomena like the Sun potentially rising in the west and setting in the east.
Venus and Uranus are notable for their retrograde rotation. Venus, with its axial tilt of around 177 degrees, spins almost completely backwards. This means it rotates clockwise when viewed from above the north pole, unlike most other planets.
Uranus, on the other hand, rolls almost completely on its side with a tilt of about 98 degrees. This skewed rotation also classifies as retrograde. These unique rotation patterns make Venus and Uranus intriguing exceptions to the typical planetary rotation rules.

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Most popular questions from this chapter

Lucky to Be Here? Considering the overall process of solar system formation, do you think it was likely for a planet like Earth to have formed? Could random events in the early history of the solar system have prevented our being here today? What implications do your answers have for the possibility of Earthlike planets around other stars? Defend your opinions.

What Are the Odds? The fact that all the planets orbit the Sun in the same direction is cited as support for the nebular hypothesis. Imagine that there's a different hypothesis in which planets can be created orbiting the Sun in either direction. Under this hypothesis, what is the probability that eight planets would end up traveling in the same direction? (Hint: It's the same probability as that of flipping a coin eight times and getting all heads.)

Which lists the major steps of solar system formation in the correct order? (a) collapse, accretion, condensation (b) collapse, condensation, accretion (c) accretion, condensation, collapse

A solar system has six terrestrial planets and four jovian planets. Each of the six terrestrial planets has at least five moons, while the jovian planets have no moons at all.

True or False. Decide whether each statement is true or false, and explain why. a. On average, Venus has the hottest surface temperature of any planet in the solar system. b. Our Moon is about the same size as moons of the other terrestrial planets. c. The weather conditions on Mars today are much different than they were in the distant past. d. Moons cannot have atmospheres, active volcanoes, or liquid water. e. Saturn is the only planet in the solar system with rings. f. Neptune orbits the Sun in the opposite direction of all the other planets. g. If Pluto were as large as the planet Mercury, we would classify it as a terrestrial planet. h. Asteroids are made of essentially the same materials as the terrestrial planets. i. When scientists say that our solar system is about \(4 \%\) billion years old, they are making a rough estimate based on guesswork about how long it should have taken planets to form.

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