A joint European-Japanese spacecraft has made its closest flyby of Mercury yet, offering new snapshots ... 103 miles above the planet’s surface, snapping highly detailed photos of its cratered ...

In astronomy, what does retrograde mean? And what connection does it have to astrology? We explain how planets move across ...

Much closer to the horizon and a distinct reddish color, the planet Mercury isn’t on most people’s observing lists. In fact, a professional astronomer last year told me it was impossible to ...

when NASA's Messenger probe took one last look at the planet's craters before crashing into its surface. BepiColombo's Mercury photos are so detailed that scientists can identify particular ...