By peering deep inside Orion's star-forming gas clouds, radio astronomers have been able to directly measure the masses of young binary stars, confirming that our theoretical models are on the right lines. By peering through thick veils of gas and dust, radio astronomers have been able to watch young binary stars orbit around one another in the heart of star-forming clouds — and, in the process, have revealed the stars' masses. Stars are born in vast c... [3675 chars]