The Interstellar Medium Interstellar Medium

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Why is the sky BLUE?Atmospheric particles are about the size of the bluewavelength of light. The Sun’s blue light is scattered in alldirections – we are seeing this scattered light in the sky.
The Milky Way: View towards the Galactic CenterNear Infrared (2 microns)Visible LightInterstellar reddening occurs because longer wavelengths passthrough dusty clouds more easily.We can “see” through dust clouds in red, infrared and radio light.
Page 1 and 2: The Interstellar MediumGas and Dust
Page 3 and 4: Emission Nebula - glowing gas
Page 5 and 6: The Milky Way: View towards the Gal
Page 7: Dust absorbs/scatters blue light mo
Page 11 and 12: How do we learnabout DUST in theISM
Page 13 and 14: Dust Temperatures: Thermal (Blackbo
Page 15 and 16: How do we learn about GAS in the IS
Page 17 and 18: How do we learn about gas in the IS
Page 19 and 20: Average ISM Characteristics:(mostly
Page 21 and 22: Measuring cool gas: 21-cm Radiation
Page 23 and 24: Measuring cool gas: Interstellar Mo
Page 25 and 26: This formaldehyde “map” shows w
Page 27 and 28: Eagle Nebula (M16, in Orion)d k l d
Page 29 and 30: The gravitational force of a few at
Page 31 and 32: Stage 2: Continuing Collapse of eac
Page 33 and 34: Stage 3: Fragmentation Ceases, a Pr
Page 35 and 36: Stage 5: Protostar II (10 million y
Page 37 and 38: Stage 7: The Main Sequence (10 bill
Page 39 and 40: Star Clusters - the result of fragm

The Interstellar Medium Interstellar Medium

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