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291. Which planet has the most circular orbit?
A) Venus
B) Earth
C) Mars
D) Jupiter
Correct Answer: A) Venus
Explanation: Venus has the least eccentric (most circular) orbit.
292. What is the name of the first spacecraft to orbit the Moon?
A) Luna 10
B) Apollo 8
C) Surveyor 1
D) Ranger 7
Correct Answer: A) Luna 10
Explanation: Luna 10 was the first satellite to orbit the Moon in 1966.
293. Which planet is known for its bright white clouds of sulfuric acid?
A) Venus
B) Earth
C) Mars
D) Jupiter
Correct Answer: A) Venus
Explanation: Venus’s clouds are composed mainly of sulfuric acid.
294. What is the name of the first spacecraft to land on Mars and transmit data back to Earth?
A) Viking 1
B) Pathfinder
C) Curiosity
D) Opportunity
Correct Answer: A) Viking 1
Explanation: Viking 1 was the first to land and send data from Mars.
295. Which planet has the fastest winds in the solar system?
A) Neptune
B) Jupiter
C) Uranus
D) Saturn
Correct Answer: A) Neptune
Explanation: Neptune’s winds can reach speeds of over 2,000 km/h.
296. What is the name of the first spacecraft to orbit an asteroid?
A) NEAR Shoemaker
B) Hayabusa
C) OSIRIS-REx
D) Dawn
Correct Answer: A) NEAR Shoemaker
Explanation: NEAR Shoemaker orbited asteroid Eros in 2000.
297. Which planet is known for its “blue spot” storm?
A) Neptune
B) Uranus
C) Jupiter
D) Saturn
Correct Answer: A) Neptune
Explanation: Neptune’s Great Dark Spot is sometimes called the “blue spot.”
298. What is the name of the first spacecraft to orbit Venus?
A) Venera 9
B) Magellan
C) Mariner 2
D) Akatsuki
Correct Answer: A) Venera 9
Explanation: Venera 9 was the first spacecraft to orbit Venus.
299. Which planet has the highest escape velocity?
A) Jupiter
B) Saturn
C) Neptune
D) Uranus
Correct Answer: A) Jupiter
Explanation: Jupiter’s escape velocity is the highest in the solar system.
300. What is the name of the first spacecraft to land on the Moon’s far side?
A) Chang’e 4
B) Luna 2
C) Surveyor 1
D) Apollo 11
Correct Answer: A) Chang’e 4
Explanation: Chang’e 4 landed on the far side of the Moon in 2019.