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Verona Rupes is a huge cliff face located on Uranus's moon Miranda. It's the tallest cliff in the solar system, as much as twenty kilometers deep. If you jumped off it, you'd fall for twelve minutes...and you could still survive. More »
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The great challenge for any climber is to conquer each continent's tallest mountain. But tomorrow's climbers can consider a far more extreme challenge: leaving Earth to climb the tallest peaks of the solar system. Here's how they'll do it. More »
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One of the worst examples of unrealistic science in movies is the overly simple alien planet. Oftentimes, our heroes will visit the desert planet, or the Irish planet. But the best extraterrestrial worlds in science fiction are the ones with variety and a realistic ecosystem. They have cities as well as countryside, and a range of environments. Here's our guide to the most realistic — and interesting — planets in science fiction. More »
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A little while back, io9er Ed said Titan was "The Awesomest Moon in the Solar System." Well where I come from, them's fightin' words. What about Earth's Moon? Mars' Phobos? Europa?? There are boatloads of kickass moons in the solar system. We break down ten contenders in a highly scientific chart to settle this debate, once and for all. More »
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