A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system.

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

Our solar system’s origin story spans billions of years and involves clouds of gas, cosmic collisions, and planetary ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

A new astronomical study suggests that Earth could one day be ejected from the solar system, not by the aging of the Sun, but ...

New research suggests that our entire solar system is vulnerable to being thrown into chaos by a distant star.

Today, it’s believed that Jupiter and Saturn, the largest planets, were the first to fully form, both within a few million ...

Scientists have discovered a colossal object approximately 435 miles wide in the frigid outer reaches of our solar system, ...

In the cold, dark outskirts of planetary systems far beyond the reach of the known planets, mysterious gas giants and ...

Jupiter, roughly 562 million miles from Earth today, has nearly 100 moons. But Batygin and his collaborator Fred Adams' ...

Mar. 17, 2025 — A combination of cosmic processes shapes the formation of one of the most common types of planets outside of our solar system, according to a new ... Webb Telescope Captures Its ...

A recent study found that Jupiter was once twice the size that it is now, making it big enough to swallow up 2,000 Earths.