Learn about Mercury, the innermost planet of the solar system and the eighth in size and mass. Find out about its surface, orbit, rotation, temperature, history, and exploration by spacecraft.

Mercury is the smallest planet in our solar system and the nearest to the Sun. Mercury is only slightly larger than Earth's Moon. Its surface is covered in tens of thousands of impact craters.

Mercury is the smallest planet in the Solar System. One of five planets visible with the naked eye a, Mercury is just 4,879 Kilometres across its equator, compared with 12,742 Kilometres for the Earth. Mercury is the second densest planet. Even though the planet is small, Mercury is very dense.

Mercury is the second densest planet, after Earth. It has a large metallic core with a radius of about 1,289 miles (2,074 kilometers), about 85% of the planet's radius. There is evidence that it is partly molten or liquid.

Learn about Mercury, the smallest and fastest planet in our solar system. Find out how it looks, how it spins, what it is made of, and how we have explored it.

Learn about the smallest, fastest, and most elusive planet in our solar system. Find out how Mercury was formed, what its surface looks like, and what missions have explored it.

Mercury is the closest planet to the sun and the smallest planet in our solar system. With a diameter of about 3,032 miles (4,880 kilometers), Mercury is less than half the size of Earth,...

Learn about Mercury, the smallest and fastest planet in our solar system. Discover its surface, interior, temperature, orbit, atmosphere, and more.

Learn about the smallest planet in the solar system, its diameter, mass, volume, density, surface features and ice deposits. Find out how Mercury is shrinking, why it has no atmosphere and how it differs from Earth.