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- 1. Multiple Choice
Very roughly speaking, we can divide stars into two groups: ___low mass stars, and high mass starsbright stars and dim starsdwarfs and giantslow mass stars, and super-giants - 2. Multiple ChoiceThe dividing line between low mass stars and high mass stars lies around ___half the mass of the Suntwice the mass of the Suneight times the mass of the Sun80 times the mass of the Sun
- 3. Multiple ChoiceDuring the fusion of hydrogen, four protons, plus some other ingredients, get turned into ___four neutronsfour photonsone helium nucleusone lithium nucleus
- 4. Multiple ChoiceA higher mass star squeezes hydrogen harder, so ___it fuses more slowlyit fuses more quicklyit fuses into lithiumit fuses into deuterium
- 5. Multiple ChoiceFor a star, the lower its mass, ___the larger its apparent magnitudethe brighter it isthe shorter it livesthe longer it lives
- 6. Multiple ChoiceHow long can a really low mass red dwarf last?a thousand yearsa million yearsa billion yearsa trillion years
- 7. Multiple ChoiceWhen a low mass red dwarf dies, it will be nearly pure ___hydrogenheliumlithiumdeuterium
- 8. Multiple ChoiceWith stars like the Sun, the material in the core ___stays in the coreconvects to the radiative zonemixes with the convective zoneconvects to the surface
- 9. Multiple ChoiceWhat is the total life span of the Sun?about two million yearsabout twelve million yearsabout two billion yearsabout twelve billion years
- 10. Multiple ChoiceThe Sun's cores is getting ___less dense and hotterless dense and coolerdenser and hotterdenser and cooler
- 11. Multiple ChoiceSince it was born, the Sun has increased in luminosity by about ___8%40%80%400%
- 12. Multiple ChoiceWhen the Sun runs out of hydrogen in the core, ___it will fuse helium into carbonit will fuse helium into oxygenit will fuse helium into neonhydrogen outside the core will start to fuse
- 13. Multiple ChoiceAs the Sun grows to well over twice its current size, it will be classified as ___a subgianta gianta supergianta hypergiant
- 14. Multiple ChoiceAs the Sun bloats up to 10 to 150 times its present size, it will be classified as ___a red subgianta red gianta red supergianta red hypergiant
- 15. Multiple ChoiceWhen it turns into a red giant, the Sun will increase its luminosity by about ___two times20 times200 times2000 times
- 16. Multiple ChoiceAt some point, after being a red giant, the Sun's core will heat up enough to fuse helium into ___carbonsiliconsodiumiron
- 17. Multiple ChoiceWhen fusion has stopped, and the Sun has blown off its outer layers, it will be classified as ___a white dwarfa red dwarfa white subgianta red subgiant
- 18. Multiple ChoiceWhen the Sun expands, it'll reach a radius very close to the size of ___Mercury's orbit nowNeptune's orbit nowEarth's orbit nowJupiter's orbit now
- 19. Multiple ChoiceAs the Sun expands it loses mass, and the Earth will ___move toward the Sun, into a smaller orbitmove out from the Sun, into a bigger orbitmove toward the Sun, into a tidal locked orbitmove out from the Sun, into a tidal locked orbit
- 20. Multiple ChoiceIn order to squeeze carbon nuclei hard enough to fuse them together, a star needs a mass ___about twice the Sun's massabout 8 times the Sun's massabout 40 times the Sun's massabout 80 times the Sun's mass
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