The Very Large Baseline Array (VLBA) has pierced through dust clouds in the Orion Nebula to measure the masses of hidden young binary stars for the first time. Radio telescopes operated by the National Science Foundation and the National Radio Astronomy Observatory studied two young stellar systems, Brun 656 and HD 294300, which remain invisible to optical telescopes but detectable through radio emissions.
The technique exploits radio waves that pass through the thick gas and dust shrouding newborn stars in their birth regions. By measuring the orbital motions of these stellar pairs, astronomers calculated their masses with precision. This data proves essential for testing stellar formation models and understanding how gravity assembles stars during their earliest phases.
The Orion Nebula, located roughly 1,350 light-years from Earth, hosts the nearest active starbirth region to our solar system. Its proximity makes it an ideal laboratory for studying stellar evolution, yet many of its youngest objects remain embedded in natal material that blocks visible light. The VLBA's interferometric capabilities, which combine signals from multiple radio dishes across North America, deliver the angular resolution needed to resolve tight binary orbits and measure stellar masses directly.
This work demonstrates radio astronomy's unique power to study obscured stellar populations that optical surveys cannot access.