Close by the Sun is Mercury, a practically atmosphere-like world that has a lot of craters. Until NASA's MESSENGER spacecraft arrived there in 2008, we knew very little about the planet—only ...

Mercury orbits the sun faster than all the other planets in the solar system. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Mercury is ...

But these young planets were unable to pull as ... to-arrive ESA/JAXA BepiColombo may help uncover Mercury’s mysterious origins. True color pictures of Venus aren’t as interesting or as ...

Mercury will retrograde from Dec. 13 through Jan. 2 in the last of four times it appears to move backward in the sky this year. Every planet has in our solar system has retrograded for at least ...

The smallest planet in our solar system is Mercury. The planet is about 1/3 of the width of Earth with a radius of 1,516 miles. Earth’s moon has a radius of just over 1,000 miles. Scientists ...