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Valles Marineris: The Grand Canyon of Mars Credit: Viking Project, USGS, NASA The largest canyon in the Solar System cuts a wide swath across the face of Mars. Named Valles Marineris, the grand valley extends over 3,000 kilometers long, spans as much as 600 kilometers across, and delves as much as 8 kilometers deep. By comparison, the Earth's Grand Canyon in Arizona, USA is 800 kilometers long, 30 kilometers across, and 1.8 kilometers deep...
The Solar System’s top 5 most amazing moons | Io: "One of Jupiter’s 4 Gallilean moons, and the closest to Jupiter itself. Perpetually tormented by Jupiter’s colossal gravitational field, it’s squeezed and crushed by formidable tidal forces, making it the most volcanically active body we’ve seen. It’s also stained yellow with sulfur, and it leaves a trail of sulfur in its wake as it orbits Jupiter."