# Astronomers Confirm Youngest Exoplanet Ever Found Elias 2-24b challenges current planet formation models at just under 1 million years old. - **Source:** [Sci.News: Breaking Science News](https://www.sci.news/) - **Published:** 2026-09-23 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/7b7cf474-26e2-4b27-bd70-e9da3889403b ## Record-breaking young exoplanet Elias 2-24b, estimated at less than 1 million years old, has been confirmed as the youngest exoplanet ever detected. Located 454 light-years away in the Ophiuchus region, it orbits a star system barely out of cosmic infancy. This makes it significantly younger than previous record holders PDS 70 and WISPIT 2 systems' planets, which are about 5 million years old. The discovery pushes the boundaries of known planetary formation timelines. ## Detection challenges Astronomers used the Keck Observatory's NIRC2 vortex coronagraph to image Elias 2-24b within a gap in its protoplanetary disk. Initial hints came from ALMA observations showing a narrow gap, followed by VLT detecting a faint light point. The planet sits at the detection limit of current telescopes, with mass estimated between 1.9-4 Jupiters. New instruments like NASA's Roman Space Telescope should make such discoveries easier in future. ## Theoretical implications Elias 2-24b's existence challenges current planet-formation models that already struggled to explain 5-million-year-old protoplanets. Its youth suggests our understanding of planetary formation processes remains incomplete. The discovery supports core accretion theory over gravitational instability for giant planet formation. The observed disk gap matches predictions of a growing planet carving its path through surrounding material. ## Observation timeline The discovery process spanned nearly a decade, beginning with ALMA's 2010s observations of the protoplanetary disk gap. ESO's Very Large Telescope later detected a light point in 2018, leading to Keck's confirmation imaging on June 21, 2018. The international team included researchers from Chile's Instituto de Estudios Astrofísicos and Universidad Diego Portales. Their findings were published in September 2026's Astrophysical Journal Letters. ## Planetary characteristics Elias 2-24b is still actively growing, accreting mass from its surrounding protoplanetary disk. Its brightness and position within the disk gap provided crucial evidence for planetary status. The system's extreme youth offers a unique snapshot of early planetary development. The dust rim's configuration closely matches theoretical predictions for planet-disk interactions during formation. ## Scientific significance This discovery provides critical data points for understanding planet formation timescales. It demonstrates that giant planets can form remarkably quickly through core accretion. The findings help explain the origin of gaps observed in very young protoplanetary disks. As the youngest known exoplanet, Elias 2-24b offers unprecedented insights into early planetary system evolution. ## Technological limitations Current telescopes operate at their detection limits for such young planets, explains researcher Andrea Bernardi. The faint signal required advanced imaging techniques like the vortex coronagraph. Future instruments promise easier detection of similar young planetary systems. This technological constraint highlights how many similar objects might remain undetected with current capabilities. ## Research implications The discovery necessitates revisions to planet formation models that couldn't fully explain slightly older systems. It provides concrete evidence that giant planet formation begins earlier than previously demonstrated. The findings will guide future studies of very young stellar systems. Elias 2-24b represents a new benchmark for understanding the earliest stages of planetary development. ## Sources covering this story - https://www.sci.news/astronomy/youngest-exoplanet-15087.html — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._