The first stars formed in the universe had _____ compared with the stars formed

Question

The first stars formed in the universe had _____ compared with the stars formed today. a. higher heavy element content and higher mass b. higher heavy element content and lower mass c. lower heavy element content and higher mass d. lower heavy element content and lower mass e. higher mass and longer lifetimes Which of the following best explains the difference between the heavy-element abundances seen in the first stars and those seen in stars that we observe today? a. Stars today have more heavy elements because modern stars have higher masses allowing them to create more heavy elements through nuclear fusion. b. Stars today have more heavy elements, because the gas that formed the current stars was enriched by the higher mass elements formed in previous generations stars c. Stars today have a fewer heavy elements, because they have been around long enough to use up the larger mass atoms. d. Stars today have abundance of heavy elements, because they haven't been around long enough to make the larger atoms. e. The stars that astronomers observe now are the first generation of stars. Each of these statements describes the steps that occur during star formation. Which of these is not also true for galaxy formation? a. Angular momentum leads to the formation of a disk. b. For both stars and galaxies, the largest objects form first, with smaller objects coming together later. c. A gas cloud radiates energy, allowing collapse further than when it was hotter. d. Gravitational instability leads collapse. e. The original large gas cloud splits into smaller fragments, because areas with higher density also have greater gravitational pull. Low-mass stars could form in the second generation because a. massive elements produced in the first stars coalesced into dust grains. b. they formed in minihalos of cold dark matter. c. waves led to the fragmentation of dark matter minihalos into microhalos. d. there was a lot more raw material available for star formation after the demise of the first stars. e. different types of fundamental forces controlled the formation of the first and second generation. Choose the answer that does not correctly describe the second generation of stars. a. They could have form with low mass, because they formed in cooler environments. b. They contain small amounts of many massive elements. c. A few of the low-mass second-generation stars have been identified in the halo of the Way. d. Their formation process is very different from that of the first generation stars. e. The low-mass second-generation stars are very hot and luminous and thus easy to detect. What do astronomers predict will be the final state of our universe? a. a Big Crunch in which everything collapses back in on itself b. an ever universe filled with mouthing but hydrogen and helium gas

Explanation / Answer

1.the first stars formed in the universe had higher heavy element content and higher mass compared with the stars formed today.

2.stars today have a smaller abundance of heavy elements,because they haven't been around long enough to make as many of the larger atoms

4.low mass stars could form in the second generation because massive elements produced in the first stars coalesced into dust grains

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