Baby Planet Under 1 Million Years Old Stuns Astronomers

Astronomers just confirmed the youngest planet ever found outside our solar system, and it's already forcing them to rethink how planets are born.

The exoplanet, named Elias 2-24b, is less than 1 million years old. That might sound ancient, but in cosmic terms, this planet is practically a newborn compared to Earth's 4.6 billion years.

Andrea Bernardi at Diego Portales University in Chile led the team that made the discovery. They found the planet hiding in a gap within a disk of gas and dust surrounding its young star, located about 450 light years from Earth.

What makes this discovery particularly tricky is that baby planets are usually buried in the leftover material from their formation. The team used advanced telescope data from Hawaii's W.M. Keck Observatory, comparing images from 2018 and 2020 to confirm that a bright spot in the disk was indeed a planet orbiting the star.

The previous record holders were planets around stars PDS 70 and WISPIT 2, both over 5 million years old. Elias 2-24b smashes that record by millions of years.

Why This Inspires

Here's where things get exciting for science. Current models suggest it should take at least 5 million years for a giant planet like Jupiter to form, and even longer for planets orbiting far from their stars like Elias 2-24b does.

But this cosmic rebel grew to between 1.9 and 4.0 times Jupiter's mass in under a million years, despite orbiting 55 times farther from its star than Earth orbits our sun. "Elias 2-24 b shows us that even our best planet formation models are still missing some important processes," said coauthor Lucas Siesa.

The timing couldn't be better for finding more of these stellar infants. NASA's Nancy Grace Roman Space Telescope, launched in August, carries advanced equipment designed specifically to spot planets hidden by their bright parent stars.

More discoveries mean better models, and better models help us understand not just how other planets form, but how our own Earth came to be. "This is just the beginning of a new era of discovery," Siesa said.

We're witnessing planet formation in real time, watching cosmic nurseries give birth to new worlds.