What is a planetary retrograde? And what connection does it have to astrology? We explain how planets move across the sky.

Pieces of Mercury may have been found on Earth, potentially allowing scientists to study the Solar System's innermost planet. While we have sent two spacecraft to Mercury – Mariner 10 and MESSENGER – ...

Nearly all of the solar system’s planets are about to file across the night sky in a planetary alignment, and it will be ...

If there ever was a planet that has gotten a bad rap for its inability to be readily observed it would have to be Mercury, known in some circles as the "elusive planet." Mercury is called an "inferior ...

The planets are visible throughout February, "but they’ll be lined up best toward the end of the month,” NASA says.

On Saturday (28 February), observers will be able to see Mercury, Venus, Jupiter, Saturn, Uranus and Neptune positioned near one another across the sky, creating a rare planetary display, reports The ...

Mercury will reach its greatest eastern elongation on Oct. 29, marking one of the best evenings to see the planet this fall as it appears farthest from the sun's glare in the twilight sky. As the ...

A visible line of planets has for weeks been the talk of astronomers and hobbyist stargazers who have sought to catch a sight of our solar system's worlds. Online chatter and a frenzy of media ...

On March 25, the MESSENGER spacecraft completed its 4,000th orbit of Mercury, and the lowest point in its orbit continues to move closer to the planet than ever before. The orbital phase of the ...