Mercury: Facts - NASA Science Quiz

What is the smallest planet in our solar system?

• Mercury

• Venus

• Mars

• Pluto

Answer explanation

Mercury is the smallest planet in our solar system, with a diameter of about 4,880 kilometers. It is smaller than Venus, Mars, and even Pluto, which is classified as a dwarf planet.

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NGSS.MS-ESS1-3

How long does it take for Mercury to orbit the Sun?

• 225 Earth days

• 687 Earth days

• 365 Earth days

• 88 Earth days

Answer explanation

Mercury takes 88 Earth days to complete one orbit around the Sun, making it the fastest planet in our solar system. The other options represent the orbital periods of different planets.

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What is the temperature range on Mercury?

• 430°C to -180°C (800°F to -290°F)

• 316°C to -101°C (600°F to -150°F)

• 260°C to -129°C (500°F to -200°F)

• 371°C to -157°C (700°F to -250°F)

Answer explanation

Mercury experiences extreme temperature variations due to its thin atmosphere. The correct range is 427°C to -179°C (800°F to -290°F), reflecting its scorching daytime heat and frigid nights.

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Which planet is the hottest in our solar system?

• Jupiter

• Venus

• Mercury

• Mars

Answer explanation

Venus is the hottest planet in our solar system due to its thick atmosphere, which traps heat through the greenhouse effect, resulting in surface temperatures that exceed those of Mercury, despite being farther from the Sun.

What is the radius of Mercury?

• 2,440 kilometers (1,516 miles)

• 6,371 kilometers (3,959 miles)

• 3,390 kilometers (2,106 miles)

• 6,779 kilometers (4,212 miles)

Answer explanation

The radius of Mercury is 2,440 kilometers (1,516 miles), making it the smallest planet in our solar system. The other options represent the radii of different celestial bodies.

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NGSS.MS-ESS1-3

How many moons does Mercury have?

• 2

• 0

• 1

• 3

Answer explanation

Mercury has no moons. It is one of the two planets in our solar system that does not have any natural satellites, the other being Venus. Therefore, the correct answer is 0.

What is Mercury's atmosphere composed of?

• Exosphere

• Dense clouds

• Thick atmosphere

• No atmosphere

Answer explanation

Mercury has a very thin atmosphere known as an exosphere, composed mainly of oxygen, sodium, hydrogen, and helium. It lacks a dense atmosphere or clouds, making 'exosphere' the correct choice.

What is the tilt of Mercury's axis?

• 5 degrees

• 23.5 degrees

• 10 degrees

• 2 degrees

Answer explanation

Mercury's axial tilt is only 2 degrees, which is significantly less than that of other planets. This minimal tilt means that Mercury has very little seasonal variation.

What is the name of the large impact basin on Mercury?

• Tycho

• Olympus Mons

• Valles Marineris

• Caloris

Answer explanation

The large impact basin on Mercury is called Caloris. It is one of the largest impact basins in the solar system, formed by a massive collision, distinguishing it from other options like Tycho, Olympus Mons, and Valles Marineris.

What is the primary component of Mercury's core?

• Gaseous

• Metallic

• Rocky

• Icy

Answer explanation

Mercury's core is primarily composed of metallic materials, mainly iron, which contributes to its high density. This distinguishes it from other planets that may have rocky or icy cores.

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NGSS.MS-PS1-1