Scientists have confirmed the existence of a planet younger than one million years orbiting the star Elias 2‑24, making it the youngest exoplanet ever observed.

The planet, designated Elias 2‑24b, was detected by analysing subtle gaps in the star’s surrounding disc of gas and dust, a technique that reveals the gravitational imprint of newly forming worlds.

How the planet was spotted

Researchers used the Atacama Large Millimetre/submillimetre Array (ALMA) to capture high‑resolution images of the protoplanetary disc encircling Elias 2‑24, a young Sun‑like star in the Ophiuchus constellation. By measuring the width and depth of three concentric gaps, they inferred the presence of three nascent planets, with the innermost – Elias 2‑24b – orbiting at roughly 0.2 astronomical units.

Modelling of the disc’s dynamics indicates that the inner planet’s mass is comparable to that of Jupiter, yet its age is estimated at under a million years, based on the star’s own youth and the disc’s evolutionary stage.

Why its youth matters

Traditional core‑accretion theory predicts that giant planets require several million years to accumulate enough solid material before gathering surrounding gas. The existence of a gas‑giant‑size planet this early suggests that alternative mechanisms, such as rapid gravitational collapse of disc material, may operate more frequently than previously thought.

The study’s lead author, a researcher at the Max Planck Institute for Astronomy, said the finding forces a reassessment of the timescales built into existing formation models. "We are seeing a planet that appears to have formed far faster than the standard picture allows," they added.

Implications for planet‑formation research

If young, massive planets can emerge within a few hundred thousand years, astronomers may need to revise population‑synthesis simulations that predict the frequency and distribution of exoplanets in the galaxy. The discovery also aligns with recent detections of massive planets in other very young systems, hinting at a broader pattern.

Future observations with the James Webb Space Telescope and next‑generation ground‑based facilities are expected to probe the atmospheric composition of Elias 2‑24b, offering clues about its formation pathway. Confirming whether such planets retain primordial gases or acquire them later will help discriminate between competing theories.

For now, Elias 2‑24b stands as a vivid reminder that planet formation can be a swift, dynamic process, reshaping our understanding of how common worlds like our own come into being.