Mercury is the first planet from the Sun and the smallest in the Solar System. It is a rocky planet with a trace atmosphere and a surface gravity slightly higher than that of Mars.

1 day ago · Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission arriving in 2026 might solve the mystery.

Nov 29, 2025 · Mercury, the innermost planet of the solar system and the eighth in size and mass. Its closeness to the Sun and its smallness make it the most elusive of the planets visible to the …

Sep 25, 2025 · Mercury has been known since ancient times because it can be seen without advanced telescopes. Because it is so close to the Sun, Mercury is hard to study from Earth.

5 days ago · Mercury is the smallest planet in the Solar System in both mass and diameter. It’s 18 times less massive than the Earth, and its diameter barely reaches two-fifths of the Earth’s size.

Jun 26, 2025 · Facts about the planet Mercury, including surface features, missions and the history of our relationship with the closest planet to the Sun.

Mercury is the smallest planet in the Solar System and the closest one to the Sun. It's also a little-explored world, full of mystery, with a surface split into extremes and an interior that puzzles …

May 7, 2025 · Explore a curated collection of resources about Mercury. These resources include activities that can be done at home, as well as videos and animations, images, and printable …

Mercury (toy manufacturer), a brand of diecast toy cars manufactured in Italy Mercury Communications, a British telecommunications firm set up in the 1980s Mercury Corporation, …

Nov 29, 2025 · With a radius of about 2,440 km (1,516 miles), Mercury is the smallest major planet, smaller even than Jupiter’s largest moon, Ganymede, or Saturn’s largest moon, Titan. …