They’re not a perfect match, but it’s way too hot on the first planet for us to hop over and confirm for ourselves.

A meteor shower, a planet sighting, and a full moon. Here's how to see all of space's eye-catching activity in July.

Mercury is the month's highlight, reaching greatest elongation July 4. Also on show in the Southern Hemisphere: Mars, Saturn, ...

Mercury moves super fast around the Sun, finishing its year in just 88 Earth days. The planet has crazy temperature swings, ...

Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new ...

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

Despite being covered in impact craters that could potentially send pieces of the planet into space, we have never found a ...

But in the early 1980s, Dennis Hope, who had been unemployed for around a year, believed he had found a loophole. The Outer ...

Mercury is a mystery. It’s the smallest planet in our solar system, the closest to the Sun, and one of the most extreme. Its ...

New research suggests that Mercury's crust is shifting and twisting in unexpected ways thanks to the force of the Sun.

Researchers now appreciate that gas planets are more complex than first thought. New findings have implications for our ...

Everything you could want to know about Mercury in our solar system. Voting ends in Greenland election dominated by Trump's control pledge Here's the Average Social Security Benefit at Ages 62, 67 ...