Earth and Mars were formed from material that largely originated in the inner Solar System; only a few percent of the building blocks of these two planets originated beyond Jupiter’s orbit. A group of ...

In late April 2026, a long-period comet will swing through the inner solar system. It will likely be visible with binoculars, ...

Long before Mercury, Venus, Earth, and Mars formed, it seems that the inner solar system may have harbored a number of super-Earths–planets larger than Earth but smaller than Neptune. If so, those ...

The James Webb Space Telescope, the most powerful space telescope ever built, has picked up highly unusual readings from an object moving towards the inner solar system. These readings have sparked a ...

"It all works like intricate clock gears. Throw more gears into the mix and it all breaks." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. What ...

Across the Milky Way and beyond, planetary systems appear to fall into a few recurring blueprints, and recent exoplanet ...

The newly identified cluster of Kuiper Belt objects lies about 4 billion miles from the Sun, offering fresh clues about how ...

This artist’s concept depicts one of the solar system’s inner planets slamming into Earth after being nudged on a collision course by a passing star. Such a world-shattering cataclysm is extremely ...