From the point of view of a photon originating in that gas cloud, it was emitted...

		jarin on Dec 14, 2011 \| parent \| context \| favorite \| on: The Milky Way's black hole may spring to life in 2... From the point of view of a photon originating in that gas cloud, it was emitted by an electron in the gas cloud and absorbed by an electron in the telescope sensor at the exact same instant.