Mercury: Facts and Observations

Mercury is the smallest planet in our solar system, located closest to the sun. It is slightly larger than Earth's moon and has extreme temperature variations. Mercury has a large metallic core, a rocky mantle, and a solid crust. It lacks a significant atmosphere but has an exosphere composed of various elements. The planet has a weak magnetic field and no moons. Mercury rotates every 59 Earth days and orbits the sun in 88 Earth days. Its harsh conditions make it unlikely to support life. Historically, it was observed by Galileo and named after the Roman messenger god. The first spacecraft to visit Mercury was Mariner 10.

Which planet is the smallest in our solar system and closest to the sun?

• Earth

• Venus

• Mars

• Mercury

What percentage of Mercury's composition is its metallic core?

• 70%

• 95%

• 85%

• 50%

What is the primary reason Mercury has no moons?

• Its lack of atmosphere

• Its proximity to the sun

• Its slow rotation

• Its small size

What is the composition of Mercury's exosphere?

• Nitrogen and Oxygen

• Hydrogen and Helium only

• Carbon Dioxide and Methane

• Oxygen, Sodium, Hydrogen, Helium, and Potassium

How does Mercury's magnetic field compare to Earth's?

• It is about the same as Earth's

• It is about 10% of Earth's

• It is stronger than Earth's

• It is about 1% of Earth's

How long does it take for Mercury to complete one rotation on its axis?

• 24 Earth hours

• 59 Earth days

• 88 Earth days

• 365 Earth days

What are the temperature extremes on Mercury's surface?

• 100°C to -100°C

• 200°C to -200°C

• 430°C to -180°C

• 500°C to -250°C

Who first observed Mercury in the 17th century?

• Isaac Newton

• Johannes Kepler

• Nicolaus Copernicus

• Galileo Galilei

What is Mercury also known as in sanctuary?

• Buddha

• Hermes

• Zeus

• Apollo

Which spacecraft was the first to visit Mercury?

• Mariner 10

• New Horizons

• Pioneer 10

• Voyager 1