Mercury, Venus, and Mars sit within the same general neighborhood as Earth, yet each has followed a radically different path. One kept a magnetic field against the odds. Another trapped so much heat ...

A new study suggests that our solar system’s smallest planet has shrunk by up to 30 percent since its birth roughly 4.5 billion years ago ...

BepiColombo will be the second mission to orbit Mercury and the first to study the planet with two spacecraft.

The planet Mercury is the smallest member of our solar system’s eight planets. However, its small size (4,880 kilometres in ...

But what exactly is a planet? It seems like an easy question. After all, you’re standing on one right now! But the scientific definition was fairly loose until recently. The discovery of other ...

An artistic rendering of the ESA's Mercury Planetary Orbiter in the foreground and JAXA's Mercury Magnetospheric Orbiter in the background near Mercury. Spacecraft: ESA / ATG medialab; Mercury: NASA / ...

As far-fetched as it may seem, quirks of orbital mechanics could allow hundreds of planets to be packed around a star ...