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In the core of a main sequence star, gas pressure _____ the weight of the overlying materials.a. is less thanb. is greater thanc. balances
Energy can flow outward from the cores of different kinds of stars bya. conductionb. convectionc. radiationd. all of the above
The main sequence has a limit at the lower end becausea. low mass stars form from the interstellar medium very rarely.b. hydrogen fusion combined 4 hydrogen nuclei to form 1 helium nucleus.c. pressure does not depend on temperature in degenerate matter.d. the lower limit represents when the radius of the star would be zero.e. there is a minimum temperature for hydrogen fusion.
The lowest mass object that can initiate thermonuclear fusion of hydrogen has a mass of abouta. 1 Mb. 60 Mc. 0.5 Md. 0.08 Me. 0.001 M
As a star like the sun exhausts hydrogen in its core, the outer layers of the stara. become hotter and more luminous.b. become cooler and more luminous.c. become hotter and less luminous.d. become cooler and less luminous.e. become larger in radius and hotter.
Giant and supergiant stars are rare becausea. they do not form as often as main sequence stars.b the giant and supergiant stage is unstable.c. the giant and supergiant stage is very short.d. helium is very rare.e. helium flash destroys many of the stars before they can become giants and supergiants.
Which of the following nuclear fuels does a one solar mass star use over the course of its entire evolution?a. hydrogenb. hydrogen and heliumc. hydrogen, helium, and carbond. hydrogen, helium, carbon, and neone. hydrogen, helium, carbon, neon, and oxygen
Which of the following nuclear fuels does a 0.2 solar mass star (red dwarf) use over the course of its entire evolution?a. hydrogenb. hydrogen and heliumc. hydrogen, helium, and carbond. hydrogen, helium, carbon, and neone. hydrogen, helium, carbon, neon, and oxygen
In the diagram above, which position would indicate that of the Sun as it approaches end of hydrogen burning in its core?a. 1b. 2c. 3d. 4e. 5
In the diagram above, locate the position of our Sun after it has commenced helium burning and has become a red giant.a. 1b. 2c. 3d. 4e. 5
In the diagram above locate the position of red dwarf stars that will never burning elements heavier than hydrogen in their cores.a. 1b. 2c. 3d. 4e. 5
Open clusters tend to be __________________ than globular clusters.a. younger and contain fewer starsb. younger and contain more starsc. older and contain fewer starsd. older and contain more starse. more luminous and cooler
What must occur for an object to be considered a main sequence star?a. Hydrostatic equilibriumb. Nuclear fusion reaction in the corec.. Protostar life beginsd. Both a and b.
Why do higher mass stars live shorter lives on the main sequence than lower mass stars?a. Higher mass stars burn through their nuclear fuel faster.b. Lower mass stars don’t get their energy from that same nuclear fusion source as higher mass stars.c. Higher mass stars have less hydrogen fuel to burn.d. Lower mass stars spend a longer time evolving to the main-sequence.e. All of the above are false.
The lowest-mass stars cannot become giants becausea. they do not contain helium.b. they rotate too slowly.c. they cannot heat their centers hot enough.d. they contain strong magnetic fields.e. they never use up their hydrogen.
A planetary nebula isa. the expelled outer envelope of a medium mass star.b. produced by a supernova explosion.c. produced by a nova explosion.d. a nebula within which planets are forming.e. a cloud of hot gas surrounding a planet.
A white dwarf is composed ofa. hydrogen nuclei and degenerate electrons.b. helium nuclei and normal electrons.c. degenerate matter..d. degenerate iron nuclei.e. a helium burning core and a hydrogen burning shell.
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