The discovery of the fourth star was done through an algorithm called QUADCOR, which isolates the distinct spectral fingerprints of all four stars simultaneously. By detecting the individual signals, ...

CAPE CANAVERAL, Fla. (AP) – The only spacecraft ever to orbit Mercury ended its four-year tour with a crash landing Thursday. NASA’s Messenger plunged from orbit as planned and slammed into the sun’s ...

NASA confirms three Mercury retrograde periods in 2026, explaining the phenomenon as an optical illusion. Get the key dates ...

Skywatchers across the Northern Hemisphere have caught a fleeting glimpse of Mercury as it made one of its final visible appearances of the year. Appearing low on the southwestern horizon just after ...

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

Mercury, often considered the “elusive planet,” is notoriously difficult to observe due to its proximity to the Sun. However, December 2025 brings a rare opportunity for skywatchers to spot this ...

A collision with an asteroid might have set the planet Mercury whirling oddly in its orbit, a new study suggests. When one body orbits another — say, a moon around a planet or a planet around a star — ...

(PhysOrg.com) -- MESSENGER scientists will highlight the latest results on Mercury from MESSENGER observations obtained during the first six months (the first Mercury solar day) in orbit. These ...