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.

Oct 21, 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. As the closest planet to the Sun it experiences extreme …

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.

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 …

Mercury’s mass is one-eighth that of Earth, making it the smallest terrestrial planet. Mercury is the smallest planet (except for the dwarf planets), having a diameter of 4878 kilometers, less than …

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. …

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 …

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 …

Nov 14, 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 …