I WONDER - How Big Is The Planet Mercury?

Mercury is the smallest planet in the solar system, with a diameter of about 4880 kilometers, making it roughly three-quarters the length of the Amazon River. It is so small that 18 Mercurys could fit inside Earth, and it is only slightly larger than Earth's moon. Interestingly, Mercury is gradually shrinking due to the cooling of the planet, which causes its iron core to solidify.

What is the approximate diameter of Mercury?

• 5200 kilometers

• 4880 kilometers

• 5000 kilometers

• 4500 kilometers

How does Mercury's length compare to the Amazon River?

• Equal in length

• Half as long

• Three-quarters as long

• Twice as long

How many Mercurys could fit inside Earth?

• 20

• 18

• 15

• 10

Which celestial body is Mercury slightly larger than?

• Jupiter's moon

• Earth's moon

• Venus

• Mars

What is causing Mercury to shrink over time?

• Impact from asteroids

• Expansion of its atmosphere

• Cooling and solidification of its iron core

• Erosion