天文学家利用美国宇航局资助的档案观测数据，确认了一颗极为年轻的系外行星Elias 2-24 b，其年龄不足100万年，刷新了已知最年轻行星的记录1。这颗行星质量相当于木星，距离其母星约为地日距离的55倍，母星距地球约450光年1。该行星仍处于形成过程中，被其母星的气尘盘所包围1。
这一发现对现有行星形成理论提出了挑战1。此前最年轻的行星记录是500多万年前的行星1，而Elias 2-24 b在远比那颗行星更远离母星的距离上，却在极短时间内完成了形成。研究团队通过结合2018年和2020年凯克天文台的观测数据进行了确认1，相关成果已于2026年9月16日发表于《天体物理学杂志通讯》1。
Astronomers have confirmed the existence of Elias 2-24 b, an exoplanet less than 1 million years old, making it the youngest planet known to science.1 The discovery, published in The Astrophysical Journal Letters on September 16, 2026, was made using archival observation data funded by NASA and combines measurements from the W. M. Keck Observatory in Hawaii collected in 2018 and 2020.1
The newly discovered world is a gas giant with a mass comparable to Jupiter, orbiting its host star at a distance of approximately 55 times the Earth-Sun distance.1 Located roughly 450 light-years from Earth, the planet remains embedded within its star's protoplanetary disk of gas and dust, indicating it is still in the process of formation.1 This finding challenges existing theories of planetary formation, as conventional models struggle to explain how such a massive planet could form at such a great distance from its star within such a brief timeframe.1 The previous record for the youngest known exoplanet was held by a world over 5 million years old.1
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