Uranus is kind of like the Luigi to Neptune's Mario. While they're both ice giants, Uranus is the second farthest from the sun and a bit smaller by diameter. With winds whipping around at more than 500 miles per hour and temperatures dipping below minus 350 degrees Fahrenheit, Uranus is a pretty hostile planet, but not quite as intense as Neptune. With no moons and barely any atmosphere, Mercury is unencumbered and it shows. Mercury is a tiny whip of a planet that circles the sun every 88 Earth days, traveling at a speed of 29 miles per second. It's the fastest orbiting planet in our solar system and also the smallest. Its rocky, pock-marked surface makes it look more like a moon than its fe. When it comes to the search for life, the dusty red planet Mars is one of the solar system's most intriguing. With atmospheric conditions most similar to Earth's and images of the surface reminiscent of our most arid environments, it's relatively easy to imagine what it's like to stand on the surface. But as far as we know, Mars doesn't harbor life. Neptune is the most distant planet from the sun with a mind-bogglingly slow orbit, taking roughly 165 years to make it all the way around. It's so far out, its actually sometimes farther away from the sun than the notoriously far-out Pluto. It's also the windiest planet, with gales hitting 1,200 miles per hour. While we understand why most planets. Venus is downright hellish. With peak temperatures reaching up to a sweltering 900 degrees Fahrenheit, it's the hottest planet. For reference, the melting point of lead is 622 degrees Fahrenheit. Its thick, yellowish atmosphere of carbon dioxide and sulfuric acid traps in heat from the sun, and the clouds literally rain down acid. With thousands of.