3 days ago · Learn about its formation, structure, atmosphere, size and distance, moons, and much more.

In 1971 Mariner 9 entered orbit around Mars, being the first spacecraft to orbit any body other than the Moon, Sun or Earth; following in the same year were the first uncontrolled impact (Mars 2) and first …

6 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. There are …

Mar 18, 2026 · Mars is the fourth planet from the Sun and the seventh largest planet in the Solar System. With evidence suggesting that it once had flowing water, Mars holds many secrets waiting to …

Scientists are uncovering how Mars transformed into the cold, dry desert world it is today. We explore Mars to understand the planet's history and look for evidence of past or even present life. Is there life …

May 20, 2025 · A guide to the Red Planet, Mars, including facts about its geology, a history of Mars missions and images captured by astrophotographers.

Jan 19, 2026 · Mars is one of the most explored bodies in our solar system, and it's the only planet where we've sent rovers to roam the alien landscape. NASA missions have found lots of evidence …

May 16, 2022 · Orbiting the sun at a distance of 141.6 million miles (210-million kilometres), Mars is the fourth planet from the sun. With a diameter of 4,228 miles (6,804 kilometres), Mars is the second …

Feb 26, 2026 · Mars is the only planet we know of inhabited entirely by robots. Learn more about the Mars Missions.

Feb 18, 2026 · The Mars Report newsletter from NASA is your source for everything on or about the Red Planet. We bring you mission updates, spacecraft news, science findings, unique Mars imagery …