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.

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 ...

According to NASA, multi-planet lineups are visible "every few years," but a seven-planet alignment is particularly uncommon, as each planet's orbit varies, with some moving more quickly and Mercury, ...

Uranus and Neptune are also still around, but they won't be appearing as brightly and will require a telescope to see, according to NASA. According to Star Walk, the next "planet parade" When is the 7 ...

Though Mercury may look drab to the human eye, different minerals appear in a rainbow of colors in this image from NASA's MESSENGER spacecraft. This visual may only be used in conjunction of ...

The planet in question is Mercury. Beginning now and running through the end of the second week of March, this somewhat overgrown version of the moon will have an evening appearance about as ...

Five planets are visible to the naked eye, according to NASA: Mercury, Venus, Mars, Jupiter and Saturn. Mars will appear reddish and high in the sky, near the Gemini constellation, Star Walk said.