Seoul Scientist Solves 4.6 Billion-Year Planet Mystery

Professor Lee Jeong-eun watched something no one had ever seen before: the exact moment when planet-building materials form around a baby star and begin their journey outward into space.

The Seoul National University astronomer received South Korea's Scientist and Engineer of the Month award in October, along with 10 million won in prize money. Her breakthrough solves a puzzle that has stumped scientists for generations.

Here's the mystery: Crystalline silicates are minerals that form the foundation of rocky planets like Earth. They only form at scorching temperatures around 730 degrees Celsius. Yet scientists kept finding these same materials in comets billions of miles from the sun, where space is frozen and dark.

How did materials that need extreme heat to form end up in the coldest corners of our solar system? Lee found the answer by doing something different: instead of taking a single snapshot, she watched a young star change over time.

Her team pointed the James Webb Space Telescope at a protostar called EC 53, which brightens and dims in a 1.5-year cycle. They tracked what happened to the materials around the star before, during, and after it flared up.

The observations revealed a cosmic conveyor belt. When the star suddenly brightens during an "accretion outburst," material rushes inward and heats up dramatically. This intense heat crystallizes the silicates right near the star.

But here's the beautiful part: powerful outflows from the spinning disk around the star then carry these newly-formed crystals outward, spreading them across vast distances. It's like a stellar delivery system.

Why This Inspires

Lee's discovery does more than solve an academic puzzle. It reveals how our own solar system worked 4.6 billion years ago, when Earth was just beginning to form.

The same process she observed likely scattered the ingredients for planets across our infant solar system. Those crystalline silicates became part of comets, asteroids, and eventually the rocky worlds we see today.

Her work represents the cutting edge of what's possible when brilliant minds meet breakthrough technology. The James Webb Space Telescope, combined with data from Chile's ALMA array, gave Lee the tools to see what previous generations could only wonder about.

The findings appeared in Nature, one of the world's most prestigious scientific journals. But Lee isn't stopping here.

"This study has revealed the full picture of material changes in the early solar system, a long-standing puzzle in astronomy," Lee said. "I want to continue researching how the ingredients of stars, planets and, further, life are born and consolidate in space."

From a telescope orbiting Earth, a Korean scientist just rewound time 4.6 billion years and watched the recipe for planets unfold.