Astronomy Solar System and Planetary Science 2 — Questions and Answers
Question 1: Which planet has the fastest rotation, completing a full spin in under 10 hours?
- Jupiter (Correct answer)
- Earth
- Mars
- Venus
Correct answer: Jupiter
Jupiter rotates once about every 9.9 hours, the fastest of any planet in the Solar System.
Question 2: What is the name of the boundary beyond which the Sun's influence gives way to interstellar space?
- Heliopause (Correct answer)
- Roche limit
- Chromosphere
- Kuiper cliff
Correct answer: Heliopause
The heliopause marks where the solar wind's pressure balances the interstellar medium.
Question 3: Which planet rotates on its side, with an axial tilt of about 98 degrees?
- Uranus (Correct answer)
- Neptune
- Saturn
- Mars
Correct answer: Uranus
Uranus is tilted roughly 98 degrees, likely due to a massive early collision.
Question 4: The Great Red Spot on Jupiter is best described as what?
- A giant persistent storm (Correct answer)
- A large impact crater
- A volcanic caldera
- A frozen methane lake
Correct answer: A giant persistent storm
The Great Red Spot is a high-pressure anticyclonic storm that has raged for centuries.
Question 5: Which moon of Saturn has a thick nitrogen-rich atmosphere and liquid methane lakes?
- Titan (Correct answer)
- Enceladus
- Mimas
- Rhea
Correct answer: Titan
Titan has a dense nitrogen atmosphere and stable surface lakes of liquid methane and ethane.
Question 6: What primarily causes the seasons on Earth?
- The tilt of Earth's rotational axis (Correct answer)
- Earth's varying distance from the Sun
- Changes in solar output
- The Moon's gravity
Correct answer: The tilt of Earth's rotational axis
Earth's roughly 23.5-degree axial tilt changes how directly sunlight strikes each hemisphere over the year.
Question 7: Which planet is the least dense, so much so that it would float in water?
- Saturn (Correct answer)
- Jupiter
- Neptune
- Uranus
Correct answer: Saturn
Saturn's average density is less than that of water, the lowest of any planet.
Astronomy Solar System and Planetary Science 2
Which planet has the fastest rotation, completing a full spin in under 10 hours?