The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

A new type of exoplanet has been discovered: Enaiposha, also known as GJ 1214 b. Long heralded as a mini-Neptune, new observations have indicated that it is a member of a category never seen before ...

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

These embryos, somewhere between small planetesimals and fully formed planets, were abundant during the solar system's formative ... in the earliest days of our cosmic neighborhood.

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.