2 days ago · Mars is the fourth planet in the solar system in order of distance from the Sun and the seventh in size and mass. It is a periodically conspicuous reddish object in the night sky. …

Nov 24, 2025 · With a radius of 2,106 miles (3,390 kilometers), Mars is about half the size of Earth. If Earth were the size of a nickel, Mars would be about as big as a raspberry. From an …

Mars retains some water, in the ground as well as thinly in the atmosphere, forming cirrus clouds, fog, frost, larger polar regions of permafrost and ice caps (with seasonal CO2 snow), but no …

Mars is the fourth planet from the Sun. It is the outermost of the solar system ’s small inner planets. The surface is rocky and dusty—the reddish color comes from particles of rust (iron …

Dec 18, 2024 · Mars orbits the Sun at an average distance of 227.9 million km (141.6 million mi), about 1.5 times farther from the Sun than Earth. Its orbit is more elliptical, leading to greater …

Valles Marineris on Mars, seen here, is the largest such valley in our solar system—hundreds of miles wide, several thousand miles long, and up to six miles (10 kilometers) deep. Like Earth, …

Today, there may still be life beneath the Martian surface, with access to water and protection from radiation and extreme temperatures. Scientists have discovered that Mars was habitable …

Mars is the fourth planet from the Sun in our solar system. Scientists believe that all of the planets were created just over 4.5 billion years ago. The solar system began as a large cloud of gas, …

Dec 1, 2025 · Our solar system has other massive bodies that pull on each other. The Sun alone accounts for more than 99% of the mass in our solar system. Mars’ position in the solar …

Nov 24, 2025 · Mars is the fourth planet from the Sun, and the seventh largest. It’s the only planet we know of inhabited entirely by robots.