Question 1

True or false: Mercury has no known moons or rings.

Accepted Answer

True. It's the only rocky planet besides Venus without a moon, and no rings have ever been detected around it.

Question 2

True or false: Mercury is the second smallest planet in the solar system, after Pluto.

Accepted Answer

False. Pluto is a dwarf planet, not a full planet. Mercury is the smallest planet in our solar system, slightly larger than Earth's Moon.

Question 3

True or false: Mercury has a very thin atmosphere composed mostly of oxygen, sodium, and hydrogen.

Accepted Answer

True. Called an exosphere, it's so tenuous it's barely there—atoms escape into space regularly, replenished by solar wind and surface impacts.

Question 4

True or false: Mercury is the only planet where the Sun rises in the west and sets in the east.

Accepted Answer

False. Venus also has a retrograde rotation, causing the Sun to rise in the west. Mercury rotates normally, so the Sun rises in the east.

Question 5

True or false: Mercury is the hottest planet in the solar system because it's closest to the Sun.

Accepted Answer

False. Venus is actually hotter due to its thick atmosphere trapping heat. Mercury's thin atmosphere can't hold heat, so it swings wildly between extremes.

Question 6

True or false: Mercury's surface is covered in ice at its poles, hidden in permanently shadowed craters.

Accepted Answer

True. Radar data confirmed water ice in deep polar craters where sunlight never reaches, despite Mercury's extreme heat elsewhere.

Question 7

True or false: Mercury has a magnetic field roughly 1% as strong as Earth's.

Accepted Answer

True. Despite its small size and slow spin, Mercury has a global magnetic field, likely from a partially liquid iron core.

Question 8

True or false: A day on Mercury (sunrise to sunrise) is longer than its year.

Accepted Answer

True. Mercury's slow rotation means one solar day lasts 176 Earth days, while its orbit around the Sun takes only 88 Earth days.

Mercury Trivia Questions