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Mars is the second smallest planet in the solar system, only larger than Mercury and slightly more than half the size of Earth. It has an equatorial radius of 3,396 km (2,110 miles) and a mean polar radius of 3,379 km (2,100 miles).
Mars Facts. Mars – the fourth planet from the Sun – is a dusty, cold, desert world with a very thin atmosphere. This dynamic planet has seasons, polar ice caps, extinct volcanoes, canyons and weather.
Mars is sometimes called the Red Planet. It's red because of rusty iron in the ground. Like Earth, Mars has seasons, polar ice caps, volcanoes, canyons, and weather. It has a very thin atmosphere made mostly of carbon dioxide, nitrogen, and argon.
Mars is no place for the faint-hearted. It’s dry, rocky, and bitter cold. The fourth planet from the Sun, Mars, is one of Earth's two closest planetary neighbors (Venus is the other). Mars is one of the easiest planets to spot in the night sky — it looks like a bright red point of light.
Learn all about the Red Planet in our fascinating facts about Mars. How big is Mars? What's the temperature on Mars? Is there water on Mars?
Olympus Mons – Mars’ Volcano. Mars has the largest volcano in the solar system – Olympus Mons. It measures some 600 kilometres across and rises nearly 27 kilometres above the surrounding terrain. It is a shield volcano built by the continuous action of flowing lava over millions and millions of years that began some 3 billion years ago.
Mars is known as a rocky, “terrestrial” planet, which makes it very similar to Earth. Recent data from the Mars orbiting missions show that the Red Planet has a solid iron core, which helps generate the planet’s weak magnetic field.
Quick facts. Mars' polar caps. Mars' climate. Orbit. Mars missions and research. Future human missions. Additional resources. Mars is the fourth planet from the sun and has a distinct rusty red...
Mars is one of the easiest planets to spot in the night sky – it looks like a bright red point of light. Despite being inhospitable to humans, robotic explorers – like NASA's new Perseverance rover – are serving as pathfinders to eventually get humans to the surface of the Red Planet.
Mars is the fourth planet from the Sun – a dusty, cold, desert world with a very thin atmosphere. Mars is also a dynamic planet with seasons, polar ice caps, canyons, extinct volcanoes, and evidence that it was even more active in the past.