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.

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

Wide-orbit planets are fairly common according to the study, and there's a good chance we have one of our own.

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

Jupiter, the largest planet in the solar system, was 2 to 2.5 times bigger ... that early Jupiter was at least double its contemporary size. The primitive version of the gas giant could have ...

Its size is estimated to be a bit smaller than Ceres, which is the smallest of the solar system's five recognized dwarf planets and has a diameter of about 590 miles (950 km). Pluto, the largest of ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region thought to be largely devoid of objects ...

And it's size is far from the only extreme feature ... cosmic moment when the building materials for planet formation in our solar system disappeared, locking in its core architecture.