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Mercury has the shortest and fastest orbit around the Sun and experiences dramatic temperature changes as it rotates. It is a world of extremes. Explore facts about our solar system's fastest planet.

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

According to many followers of astrology, part of the reason could be the pesky planet Mercury. The basic belief is that when Mercury is in “retrograde”, things may not go as planned more ...

Also one of the facts about planets is that Mars had a thick atmosphere in the past. It is believed to have water in the past ...

Mercury – named after the Roman god Mercury, the messenger to the gods – is the smallest and closest to the Sun of the eight planets in the Solar System, with an orbital period of about 88 ...

Narrator: As the solar system grew, four rocky planets: Mercury, Venus, Earth and Mars, were created closest to the Sun. Made of rocks and metals, they have solid surfaces and a central core of ...

Learn how you can see bright Jupiter from Earth, helped by its massive size and banded, reflective cloud tops, in December's ...