Far beyond Neptune, strange orbital patterns suggest the Solar System may still contain a massive unseen planet. Planet 9 ...

For decades, Uranus, Neptune, and Pluto remained distant worlds wrapped in mystery, their true nature hidden beyond the reach ...

For obvious reasons, the Sun’s influence weakens as you get closer to the edge of the solar system. But things might be a lot more complicated than we previously thought, according to a new study.

The new goal of the revamped program was to study the outer solar system and the interstellar medium beyond the sun’s ...

NASA's record-breaking New Horizons spacecraft has awoken from a 321-day hibernation in "good health" as it resumes unprecedented science at the solar system's edge.

In the latest research, telescope observations of 3I/ATLAS examine its chemical structure and suggest that it took shape in a peripheral region of a relatively calm planetary system ...

Researchers probe the geochemistry of the moon, Mars, asteroids, and water worlds to understand our home and plan for future ...

A possible giant planet far beyond Neptune has never been seen, yet astronomers continue searching for it. Strange movements ...

The probe is set to become the third human-made object to leave the solar system, but it must first cross this mysterious boundary.

Life on Earth underwent a long evolutionary journey that eventually gave rise to us, the purportedly intelligent species that dominates the planet.

A speculative paper argues that ancient planetary flybys may have helped trigger some of Earth’s mass extinctions.

NASA's New Horizons Spacecraft Just Woke Up From a Long Nap Ahead of Exploring Beyond Pluto ...