What is the first planet in our solar system?

• Earth

• Mercury

• Mars

• Venus

How long does it take Mercury to orbit the Sun?

• 24 hours

• 88 days

• 59 days

• 365 days

What percentage of Mercury's radius is made up by its iron core?

• 55%

• 70%

• 85%

• 90%

What is a significant consequence of Mercury's cooling iron core?

• Wrinkling and shrinking of the planet

• Increase in volcanic activity

• Formation of new craters

• Expansion of the planet

Why isn't Mercury the hottest planet despite being closest to the Sun?

• It has a lot of water

• It is far from the Sun

• It has a thick atmosphere

• It has a thin exosphere

What is the temperature range on Mercury?

• -100°F to 200°F

• -50°F to 150°F

• -300°F to 800°F

• 0°F to 500°F

What is the name of the large crater on Mercury?

• Valles Marineris

• Ceris Basin

• Olympus Mons

• Tycho Crater

Which spacecrafts have visited Mercury?

• Galileo and Cassini

• Voyager 1 and 2

• Pioneer 10 and 11

• Mariner 10 and Messenger

What is the main reason for the difficulty in observing Mercury from Earth?

• Its fast rotation

• Its proximity to the Sun

• Its small size

• Its thick atmosphere

What Roman god is Mercury named after?

• Mercurious

• Jupiter

• Mars

• Neptune