Mercury, the smallest planet in the solar system, holds an outsized secret that some researchers believe could reshape how ...

A European-Japanese space mission will reach Mercury in 2026, carrying instruments designed to answer a question that has quietly unsettled planetary science for decades: how does a planet like this ...

The early years of our solar system were a period of unimaginable chaos and violence, a gravitational free-for-all where colliding planetary embryos competed for survival. In this tumultuous ...

Of the eight known planets in the Solar System, Mercury is the smallest and closest to our star, the Sun. Mercury has been known since the time of ancient Babylon, in the 14th century BC. Its name ...

WASHINGTON -- Researchers have cracked a mystery at the core of Mercury -- and say there's molten fluid inside the tiny planet. They did it by using the same trick as cooks who want to know if an egg ...