{"id":229,"date":"2025-07-16T08:20:24","date_gmt":"2025-07-16T15:20:24","guid":{"rendered":"https:\/\/scienceblog.com\/esa\/?p=229"},"modified":"2025-07-16T08:20:24","modified_gmt":"2025-07-16T15:20:24","slug":"astronomers-catch-a-solar-system-being-born-for-the-first-time-ever","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/esa\/2025\/07\/16\/astronomers-catch-a-solar-system-being-born-for-the-first-time-ever\/","title":{"rendered":"Astronomers Catch a Solar System Being Born \u2014 for the First Time Ever"},"content":{"rendered":"

Scientists have witnessed the earliest stages of planet formation ever observed, watching hot minerals crystallize into solid particles around a baby star 1,300 light-years away. This discovery, published in Nature, marks the first time researchers have caught a planetary system at the very moment when planets begin to form\u2014providing a cosmic time machine to study our own solar system’s birth.<\/p>\n

The breakthrough came from studying HOPS-315, a young star surrounded by a swirling disc of gas and dust called a protoplanetary disc. Using the James Webb Space Telescope and the Atacama Large Millimeter Array (ALMA), astronomers detected silicon monoxide (SiO) transitioning from gas to solid crystalline minerals\u2014the crucial first step in planet formation.<\/p>\n

A Window to Our Past<\/h2>\n

“For the first time, we have identified the earliest moment when planet formation is initiated around a star other than our Sun,” explains Melissa McClure, lead author from Leiden University. The finding offers unprecedented insight into how rocky planets like Earth come to exist.<\/p>\n

In our solar system, similar crystalline minerals are found trapped in ancient meteorites\u2014primordial rocks that scientists use to date when our solar system began forming. These meteorites contain the same silicon monoxide compounds now being observed around HOPS-315, but in their fully solidified state.<\/p>\n

Co-author Merel van ‘t Hoff from Purdue University describes their discovery as “a picture of the baby Solar System,” noting that “we’re seeing a system that looks like what our Solar System looked like when it was just beginning to form.”<\/p>\n

The Birth Process Revealed<\/h2>\n

The research team discovered that the mineral formation is occurring in a region equivalent to our asteroid belt’s location around the Sun. This positioning isn’t coincidental\u2014it’s exactly where astronomers would expect to find the building blocks of rocky planets.<\/p>\n

The process works like this: In the extreme heat near young stars, silicon monoxide exists as a gas. As temperatures drop with distance from the star, this gas begins condensing into solid crystals. These tiny particles then stick together, gradually growing larger until they form kilometer-sized “planetesimals”\u2014the seeds that eventually become planets.<\/p>\n

Key findings from the study include:<\/p>\n