What processes determine the distribution of physical conditions within star-forming regions, and why does star formation occur in only a small fraction of the available gas?
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What processes determine the distribution of physical conditions within star-forming regions, and why does star formation occur in only a small fraction of the available gas?
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- Describe how energy generated in the core of a 1-solar-mass star gets to the star's surface.List the following 5 terms in order through a stars life cycle (starting with the sun), through the remainder of its lifetime: a. Black dwarf b. Planetary nebula c. Red giant d. Star (Sun) e. White dwarfIf an open cluster contains 650 stars and is 27 pc in diameter, what is the average distance between the stars? (Hint: On average, what share of the volume of the cluster surrounds each star?)
- If an open cluster contains 350 stars and is 48 pc in diameter, what is the average distance between the stars? On average what, share of the volume of the cluster surrounds each star?How is the blue color of a reflection nebula related to the blue color of the daytime sky?What evidence is there that star formation has occurred recently?
- If a giant molecular cloud is 38 pc in diameter and a shock wave can sweep through it in 6 million years, how fast is the shock wave going in kilometers per second? (Notes: 1 pc = 3.1 1013 km; 1 yr = 3.2 107 s.) answer in km/sMatch each statement with the appropriate item (if the first corresponds to B and the next 4 to C, enter BCCCC) 1) group of stars that was formed all at the same time, with the same composition 2) the top of the main sequence of a cluster; more massive stars in the cluster have already evolved 3) globular clusters stars that are burning helium in their core 4) young, spread out star cluster 5) old, dense star cluster A. main sequence turnoff B. open cluster C. star cluster D. horizontal branch stars E. globular clusterA giant molecular cloud is 30 pc in diameter and has a density of 339 hydrogen molecules/cm^3. What is it's mass in units of solar masses? (notes: the volume of a sphere is 4/3pieR^3, and the mass of a hydrogen atom is 1.67 x 10^-27kg. A hydrogen molecule consists of 2 H atoms