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Mercury is the closest planet to the sun, the fastest planet orbiting the sun and the smallest planet in our solar system.

Planet Mercury is the sun's nearest planetary neighbor. It has short years, long days, huge surface temperature fluctuations and really weird sunsets.

Explore our 25 weird solar system facts and see how our neighborhood is stranger than we could ever imagine.

Science Fiction & Fantasy   — by Andrew Liptak — There is no better example of how science fiction’s tendency to try and imagine a plausible future is like throwing a dart at a moving target than Larry Niven’s 1964 short story “The Coldest Place.” Up to that point, astronomers widely believed that the planet Mercury was tidally locked to the Sun: its rotation matched that of its orbit and as a result, only one side ever faced the Sun, meaning that its dark side would have been much cooler. Niven took that bit of knowledge and incorporated it into his story—his first—and sent ...

10 Stunning New Ways To Visualize How The Earth Works Earth’s green-blue visage is awful nice, but we see it so often that we’re sick of it. Luckily, NASA and other space agencies are constantly dreaming up new ways to visualize the countless terrestrial processes we take for granted. 10Earth’s Plasmasphere The plasmasphere is the inner portion of Earth’s magnetic field, and it’s fabulous. Recently, astronomers have found a constant flux of particles between the two electrically charged regions, forming a terrestrial version of the solar wind. As solar UV radiation strikes the atmos...