The Interstellar Medium Interstellar Medium

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Why do stars form? → Gravity.Every particle in the universe is attracted to every other particle.They are most attracted to their nearest neighbors because of 1/d 2 .Interstellar clouds are pulled inward by their own “weight.”What counteracts t this tendency for “collapse?”→ Heat = Motion.(Remember: Temperature is a measure of motion.)
The gravitational force of a few atoms on each other is smallcompared to the effect of heat (random motion of the atoms) sothey do not bind together into a lasting clump of matter.How many atoms (how much total mass) is required for thecollapse of an ISM cloud?That depends on Temperature!For T = 100 K, ~10 57 atoms are needed (~1 solar mass)!
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 and 8: Dust absorbs/scatters blue light mo
Page 9 and 10: The Milky Way: View towards the Gal
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: Eagle Nebula (M16, in Orion)d k l d
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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