Interstellar Dust

Evidence for Dust

• pioneering papers: Barnard (1907) (1910); Trumpler (1930)
• dark clouds: in Aquila, Carina; Barnard 68 here and here, 163; infrared views of HH 46/47, B68
• Milky Way lanes
• the Zone of Avoidance
• reflection nebulae

Quantifying Effects of Dust

• extinction: curve
• reddening and selective extinction

The Dusty Interstellar Medium

• the sky in near, mid-far infrared
, Planck IR/mm thermal dust
• visible and IR M31
• gas-phase abundance depletion pattern here and here