Labrador mix alerts his owner, a fisheries technician, to the presence of brown bears while he works salmon streams.
A new form of black hole archeology, linking spin to gas and dust, has revealed that these cosmic titans spin faster than ...
A massive filament of gas and dust, designated X7, has been elongated during its long approach to the Milky Way galaxy's supermassive black hole Sagittarius A*. See W.M. Keck Observatory imagery of X7 ...