AST 307 · Introductory Astronomy
Fall 2003


Chapter 19  Oct. 22

  1. What forces tend to pull a molecular cloud together, and what forces tend to resist its contraction?

  2. Describe the concept of equilibrium.

  3. What does it mean to say that a protostar is in hydrostatic (or pressure-gravity) equilibrium, but not in thermal equilibrium? What happens as a result?

  4. How can we observe protostars, and how do they differ in appearance from main-sequence stars?

29 October 2003
Astronomy Program · The University of Texas at Austin · Austin, Texas 78712
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