Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have ...

OF201 spends only 1% of its orbital time close enough to us to be detectable. The presence of this single object suggests ...

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

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.

A passing star has been discovered that could cause chaos in the Solar System, sending Earth flying out of orbit.

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

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

Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it travels on a highly ...

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 ...

There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be ...