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.

Jan 6, 2026 · Mercury has a radius of about 2,440 km, and its surface area is 74,797,000 km 2. Its mass is 3.30 × 10 23 kg. Mercury is the smallest major planet in both size and mass.

Apr 25, 2025 · Mercury formed about 4.5 billion years ago when gravity pulled swirling gas and dust together to form this small planet nearest the Sun. Like its fellow terrestrial planets, Mercury has a …

At 5.427 g/cm³, Mercury has the second largest density in the Solar System. It is only slightly denser than Earth. Its density is the biggest thing in common that Earth and Mercury share. Mercury’s mass …

Feb 26, 2024 · Mercury is the smallest planet in our solar system, and as a result, it possesses a relatively small mass. With a mass of approximately 0.055 times that of Earth, Mercury is …

Aug 31, 2016 · But because Mercury's small mass is enclosed inside of a tiny body, the planet is the second densest in the solar system, weighing in at 5.427 grams per cubic centimeter, or 98 percent …

Dec 24, 2025 · 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.

The core accounts for approximately 70% of Mercury’s total mass, suggesting the planet is primarily a giant ball of metal with a relatively thin crust and mantle. The significant mass difference between the …

It takes 88 Earth days to orbit the Sun, and rotates very slowly at a rate of 1 rotation every 58.7 Earth days. Its mass is 3.3 x 10 23 kg or 0.055 Earth masses. It has no moons, little to no atmosphere and …

The mass of the planet Mercury is approximately 3.285 × 10 23 kg. This is only 6% of Earth's mass.