A European-Japanese spacecraft has beamed back some of the best close-up photos yet of ... mathematician who contributed to NASA's Mariner 10 mission to Mercury in the 1970s and, two decades ...

Editor's Note: If you get a good photo of Mercury, and would like to share it with Space.com's readers, send your photo(s), comments, and your name and location to [email protected].

New photos of Mercury's mysterious north pole reveal a ... during the day, according to NASA. But the planet lacks an atmosphere to hold that heat in — so, on Mercury, dark equals cold.