Astronomers have long sought to understand the processes that lead to the birth of planetary systems. Recently, a major ...

The discovery was made by astronomers using the Subaru Telescope, which is situated atop a dormant volcano in Hawaii.

A fascinating glimpse into how a solar system like our own is born has been revealed with the detection of planet-forming ...

If it exists, it would take Planet Nine between 10,000 and 20,000 years to make a complete orbit around the sun. In comparison, Neptune takes about 165 years. This story was reported from Los Angeles.

Currently, our solar system recognizes 8 planets, with Pluto being demoted to a dwarf planet floating in the Kuiper Belt in 2006. Planet Nine's gravitational pull may explain what keeps the icy ...

WASP-121b, an already unusual planet, might have a remote origin that explains some of its peculiar properties—from iron rain ...

Astronomers have been scouring the outer solar system for signs of a hypothetical ninth planet for almost a decade, without success. However, we may finally be on the cusp of finding it, experts say.

This artist’s concept depicts one of the solar system’s inner planets slamming into Earth after being nudged on a collision course by a passing star. Such a world-shattering cataclysm is ...

Unknown Planet May Exist in Our Solar System, Experts Say. Astronomers have been searching for evidence that Planet Nine exists for years. By. Becca Longmire. Becca Longmire.

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

Jupiter is not only the largest in the solar system, but is so humongous that it's more than twice as massive as the other planets combined.. The gas giant is about 11 times wider than Earth alone ...