Early in the Solar System's history, Mercury may have been struck by a planetesimal of approximately 1⁄6 Mercury's mass and several thousand kilometers across. [44]

Nov 29, 2025 · 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.

Among the four inner Solar System planets, Mercury is the smallest and very dense, its vast iron core dominating its internal structure.

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, …

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. …

Mar 27, 2025 · Mercury’s mass is 3.3010 x 10^23 kg (7.28 x 10^22 lbs), 20 times less massive than Earth. Mercury’s size is smaller when compared to other celestial bodies in the solar system.

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 …

Dec 3, 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 …

Mar 26, 2024 · Core: One of Mercury’s most notable features is its disproportionately large core, which makes up about 60% of the planet’s total mass. This is significantly larger in proportion …

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