... Late last month a team of Mars-watching astronomers sighted an immense cyclonic storm system raging near the Red Planet's north pole. ... One of the most identifiable nebulae in the sky, the Horsehead Nebula in Orion, is part of a large, dark, molecular cloud. ... The above picture is actually a composite of over 200 images made by satellites orbiting the Earth. ... Here, a high concentration of dust and molecular gas absorb practically all the visible light emitted from background stars. ...