"What surprised us, at the end, was how effective this type of impact could be in explaining Mercury's unusual structure ...

Turns out, it's as tough to drop inward into the inner solar system, as it is to head outward. The problem stems from losing ...

The sun just released a burst of a rare form of helium known as helium-3 ( 3 He). What's peculiar is this lightweight, ...

Four planets in the solar system are about to appear in alignment in the night sky. Here's how stargazers will be able to see ...

These craters are among the coldest locations in the Solar System, despite Mercury being the closest planet to the Sun. The images also highlight Borealis Planitia, a vast expanse of smooth plains ...

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 short, yes. As the fastest-moving planet in our solar system, Mercury goes retrograde three to four times a year. When you factor in the shadow period of the retrograde—and as a recovering ...

Retrograde is when a planet is described as “going backwards.” In reality, Mercury does not move backward in the sky, nor can it (or can any other planet) slow down. Mercury's retrograde motion is ...

Just when you think Snapchat couldn’t get more creative, it drops something that gets everyone buzzing again. Yup, the same ...

As the fastest-moving planet in our solar system, Mercury goes retrograde three to four times a year for about three weeks. While planets, Mercury included, do not move backwards, they do slow ...

Planets' temperatures are largely influenced by their structural characteristics and proximity to the Sun, however, Venus ...

The solar system has many more moons than the one we ... The two innermost planets, Venus and Mercury, will shine together low in the western sky at sunset on March 10. Here's how to get the ...