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Photo: Kevin Gill from Los Angeles, CA, United States, Wikimedia Commons, CC BY 2.0.Embark on an interplanetary journey with our quiz about Mars, the fascinating fourth planet from the Sun. Test your knowledge of its landscapes, its explorers and its unique features.
Martian Recruit 0–4 · Red Planet Pro 5–8 · Olympus Mons Master 9–10
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Olympus Mons is a massive shield volcano on Mars, standing about 25 km (16 mi) high and stretching over 600 km (370 mi) across its base. Its enormous size is partly due to Mars's lower gravity and lack of tectonic plates, allowing lava to continuously erupt from a single hotspot for billions of years without the volcano moving off the plume.
Photo: ESA/DLR/FUBerlin/AndreaLuck, Wikimedia Commons, CC BY 2.0.
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The red color of Mars comes from iron oxide, commonly known as rust, which is abundant in the planet's soil and dust. It is the same stuff that makes an old bike turn orange-brown. The fine dust particles, lifted by winds, contribute to the planet's overall rusty appearance, making it easily identifiable in the night sky.
Photo: Jonasfolmer, Wikimedia Commons, CC BY-SA 4.0.
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Mars's atmosphere is extremely thin, less than 1% as dense as Earth's, and about 95% of it is carbon dioxide. Because the air is so thin, it holds very little heat, so Mars is cold and temperatures swing a lot between day and night.
Photo: Andrea Luck from Glasgow, Scotland, United Kingdom, Wikimedia Commons, CC BY 2.0.
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A Martian day, or 'sol,' is only slightly longer than an Earth day, lasting about 24 hours and 37 minutes. This similarity in rotation period means that future human missions to Mars would experience a day-night cycle quite comparable to what they are used to on Earth, simplifying daily routines. This makes Mars unique among other planets in our solar system for its similar day length.
Photo: Kevin Gill from Los Angeles, CA, United States, Wikimedia Commons, CC BY 2.0.
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Mars has much weaker gravity than Earth, about 38% as strong. A backpack that weighs 10 kilograms on Earth would feel like less than 4 kilograms on Mars. Future explorers could jump about two and a half times as high there, though their muscles and bones would need extra care.
Photo: Wikideas1, Wikimedia Commons, CC0.
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While evidence suggests Mars once had abundant liquid water, most of its water today is locked up as ice. Significant amounts are found in the planet's polar ice caps, which contain both water ice and frozen carbon dioxide, and substantial quantities are also believed to exist as permafrost beneath the surface. Liquid water is unstable on the surface due to the low atmospheric pressure.
Photo: ESA/DLR/FU Berlin, Wikimedia Commons, CC BY-SA 3.0.
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Valles Marineris is an immense canyon system that spans about 4,000 kilometers (2,500 miles) across the Martian equator. To put that in perspective, it is roughly the width of the continental United States and significantly larger than Earth's Grand Canyon, making it one of the largest canyons in the Solar System. Its formation is still debated, but it's likely linked to tectonic activity and crustal stretching.
Photo: NASA / USGS (see PIA04304 catalog page), Wikimedia Commons, Public domain.
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The United States was the first to successfully orbit Mars with its Mariner 9 spacecraft in November 1971. This mission provided detailed images of the Martian surface, including its polar caps, volcanoes, and canyons, revolutionizing our understanding of the planet. Mariner 9 also observed the beginning of a global dust storm, a common Martian phenomenon.
Photo: NASA, Wikimedia Commons, Public domain.
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Phobos and Deimos are tiny, potato-shaped moons that look a lot like asteroids, which is why some scientists think Mars captured them. Others think they formed from debris after a giant impact on Mars, so the debate is still open. Phobos is slowly spiraling inward and is predicted to crash into Mars or break apart in tens of millions of years.
Photo: NASA / JPL-Caltech / University of Arizona, Wikimedia Commons, Public domain.
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The planet Mars is named after the Roman god of war, Mars, due to its reddish appearance, which reminded ancient civilizations of blood. This association with conflict and battle has persisted through history, influencing its depiction in art and literature. The Greek equivalent of Mars was Ares, also a god of war.
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