Astronomers using NSF’s Very Large Array (VLA) have spotted the huge flow of gas near HW2 — a massive protostar located 2,283 light-years away in the star-forming region Cepheus A — which allows the rapid growth of the protostar. Ammonia gas infalling into an accretion disk feeding the protostar HW2. Image credit: NSF / AUI / NSF / NRAO / B. Saxton. The large reservoir of interstellar gas needed to build up a massive star, dozens of...