Scientists glimpse planetary birth

(CN) — In a groundbreaking discovery, astronomers have peered into the heart of a young star system and captured the first hints of planetary material just beginning to form.

Scientists have long theorized that planets, including those in our solar system, form from interstellar dust and gas as it condenses around a newborn star. Yet until now, the precise moment and conditions that trigger this process have remained elusive.

Melissa McClure, a researcher from Leiden University in the Netherlands, worked alongside colleagues to focus on HOPS-315, a protostar located about 420 parsecs from Earth in the Orion B molecular cloud. By studying these very young stars, known as protostars, the researchers hoped that planet formation could be captured in its earliest stage — what they call “time zero.”

Positioned in such a way that its inner, gaseous disk is visible through a natural gap in the surrounding material, HOPS-315 offered a rare opportunity. Using the James Webb Space Telescope’s infrared capabilities and the Atacama Large Millimeter/submillimeter Array’s wave observations, the team analyzed the composition and structure of the gas and dust surrounding the star.

The observations, published in Nature on Wednesday, revealed that the disk was already beginning to cool and condense into solid materials — precursors to planet formation. These early condensates match predictions from models describing how terrestrial planets, like Earth, could have formed in the early solar system.

This discovery could provide a valuable window into the physical and chemical environment where planets are born, the researchers say. The resemblance between HOPS-315’s disk and early solar system conditions suggests that we may be witnessing the same processes that led to the formation of Earth and its planetary neighbors.

Continued observation of HOPS-315 could deepen our understanding of the earliest stages of planetary system development and help answer longstanding questions about how worlds like ours begin.