. Cold clouds of hydrogen gas, from which stars may one day coalesce, reveal themselves to radio eyes as shadows against relatively warmer, brighter clouds behind them. We are studying these interstellar silhouettes with data from the Canadian Galactic Plane Survey and VLA Galactic Plane Survey . NAIC : . Steven Gibson , . Calgary : . Jeroen Stil , Russ Taylor . DRAO : . Peter Dewdney , Lloyd Higgs . Exeter : . Chris Brunt . UBC : . Bill McCutcheon . Hamburg : . Heinz Wendker . Maintained by Steven Gibson