The leading explanation for all of these mysteries is known as the giant impact hypothesis. According to this story, when the solar system was just getting started, a Mars-size protoplanet named Theia ...

Astronomers have traced the origin of asteroid 2024 YR4, which appears to have broken off from a larger space rock.

A new image has emerged of the Red Planet rising above the lunar limb after being occulted by the moon in January.

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Full moons mark the zenith of the monthly lunar cycle, during which the sun and moon are at odds with one another in the ...

The moon is weird. It's completely unlike anything else in the solar system. So how did our planet end up with such a special moon? The answer is that, surprisingly enough, the moon is a piece of ...

Credit: MARK GARLICK/SCIENCE PHOTO LIBRARY/Getty Images The moon is weird. It's completely unlike anything else in the solar system. So how did our planet end up with such a special moon?