Gas clouds that form stars are pulled together by which of the following?
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A: D
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A: Required : Correct statements .
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- Asap plzzzOrder the following statements so that they make sense according to star birth stages 1.At this stage, energy moves to the surface primarily through convection. At the end of this stage, the photosphere's temperature can reach 3,000K 2.In this stage, nuclear fusion starts and the energy transport mechanism switches from convection to radiative diffusion 3.In this stage, nuclear fusion rate is high enough to balance out the rate of radiative energy escape the surface 4.During this stage, gravitational contraction causes its luminosity to decrease because the protostar gets smaller while its surface temperature stays the same1) a) Calculate the Jeans length for the dense core of a giant molecular cloud with T=10 K, n = 1010/m³, and µ=2. b) Estimate the adiabatic sound speed for this core, using y=5/3. c) Use this speed to find the amount of time required for a sound wave to cross the cloud t3=2Rj/vs. d) Compare your answer with the free-fall scale and comment your results.
- 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 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?The oldest open clusters are a. 3 to 4 billion years old. b. 6 to 7 billion years old. c. 9 to 10 billion years old. d. 12 to 13 billion years old. e. 16 to 17 billion years old.
- why do dark streaks appear in visible light images of the Trifid nebula, but appear bright in an infared imageStars have the greatest metal content in which region of the Milky Way Galaxy? a. in the galactic halo b. in the nuclear bulge c. in the disk d. in the core e. in the spherical componentExplain pre main sequence evolution, early post main sequence evolution and advanced evolutionary stages.