What is special about Mercurys size?

Answer 1

It is much denser that any other planet (size for size).

The Earth is a bit denser than Mercury but that is due to gravitational compression. Yet, if they were the same size, mercury would be the most dense.

Answer 2

Mercury is the smallest planet in our solar system, with a diameter of about 4,880 kilometers (3,032 miles). Its small size contributes to its high density, making it the second densest planet after Earth. Mercury's size also plays a role in its extreme temperature variations between its scorching daytime and freezing nighttime temperatures.

Answer 3

The planet Mercury is smaller than Earth, with a diameter of 4,879 km. Its core is composed mainly of iron, and similar to Earth, the planet has an outer crust and a mantle.

Answer 4

Uranus is 51,118 km across about 4 times wider than Earth.

Answer 5

The diameter is 4880 kilometres. There is no measure in a spheroid which corresponds to length.