Astronomers have discovered a "fossil" world lying in the outskirts of the solar system, according to new research.

It's the earliest stage of planet formation ever seen by scientists. The new planetary system is taking shape around HOPS-315 ...

The astronomers observed hot minerals just beginning to solidify – the first specks of planet-forming material, the ...

PARIS: Astronomers have, for the first time, observed the earliest stage of planet formation around a distant star, offering ...

Astronomers have, for the first time, observed the formation of planets around a distant star, shedding light on our own ...

Some may remember that Pluto was once considered our solar system’s ninth planet until it was demoted to dwarf planet in 2006, when scientists began to realize how many planetary bodies exist ...

"The solar system’s distant reaches exhibit a wealth of anomalous dynamical structure, hinting at the presence of a yet-undetected, massive trans-Neptunian body — Planet 9," the study abstract ...

For now, the outer reaches of our 4.6 billion-year-old solar system continue to be shrouded in mystery, with the classification of objects changing as scientists gain a new understanding of them ...

The quest to find hidden worlds. Searching for planets lurking in the frigid edges of our solar system is not a new concept. The so-called Planet Nine, a world 10 times more massive than Earth, is ...

From the slate gray of Mercury to the ruddy brown of Pluto, the worlds in our solar system are a veritable rainbow of colors. But what makes them all look so different?

While we have a precise (and probably accurate) age for the solar system, we do not have precise ages for each planet. Skip to content Introducing the all-new Astronomy.com Forum!