Mercury retrograde: Several planets appear to 'step back,' and here's what that means. The planets that fall inside Earth's orbit around the Sun – Mercury and Venus – mostly appear to be ...

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.

Mercury moves into Taurus, and the planet of the mind takes on a slower, more deliberate vibe. This presents the opportunity ...

Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn more about our cosmic home. The solar system is our cosmic neighborhood, made up of ...

The solar system's smallest planet is quickly approaching superior conjunction, so catch it in the morning sky while you can.

The planet is "crumbling to pieces," shedding the equivalent of Mount Everest’s mass every 30.5-hour orbit and will be ...

The planet orbits its host star in just 30.5 hours, losing a mass of material roughly equal to Mount Everest each time ...

Venus and Saturn will be the easiest to spot — but for those with a clear view of the horizon, Mercury can be observed hanging low and bright in the cosmos. This planet parade — when planets ...