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- 1. Multiple Choice
What are the two opposing forces that keep stars between collapsing and inflating?centripetal force and electron degeneracy forcecentripetal force and the pressure of hot gassesgravity and electron degeneracy forcegravity and the pressure of hot gasses - 2. Multiple ChoiceHydrogen fusion makes helium. "Triple-alpha" helium fusion makes ___lithiumboroncarbonsulfur
- 3. Multiple ChoiceCarbon will fuse in the core of a star that has more relative mass than ___about four times the Sun's massabout eight times the Sun's massabout 18 times the Sun's massabout 40 times the Sun's mass
- 4. Multiple ChoiceIf a star has more than about eight times the Sun's mass, it can fuse carbon into ___neon, magnesium and some sodiumoxygen, magnesium and some sodiumneon, oxygen and some sodiumneon, magnesium and some oxygen
- 5. Multiple ChoiceA star becomes a ticking time-bomb once silicon starts fusing into ___calciumcadmiumironlead
- 6. Multiple ChoiceWhen helium fusion begins, a massive, blue, main sequence star will become ___a red dwarfa blue dwarfa blue gianta red super giant
- 7. Multiple ChoiceWhich bright star, in the constellation Orion, is a red super giant?RigelBetelgeuseBellatrixSaiph
- 8. Multiple ChoiceVY Canis Majoris, the largest known star, is two billion km across and is classified as ___a hypergoliatha mega-titana hypergianta mega-leviathan
- 9. Multiple ChoiceThe core of a supergiant star looks like an onion because it has ___white inner layersa brown outer layermultiple layersa bulb shape
- 10. Multiple ChoiceThe Sun can fuse hydrogen for over ten billion years, while a star twice as massive runs out of hydrogen in ___two billion yearsfive billion yearsthe same amount of timetwenty billion years
- 11. Multiple ChoiceIn massive stars, the fusion of which element occurs at a "ridiculously high rate"?carbonneonoxygensilicon
- 12. Multiple ChoiceWhich element, in its creation, removes energy from a star's core and also sucks up electrons?neonoxygensiliconiron
- 13. Multiple ChoiceAs the core collapses, if a star has less than twenty times the Sun's mass, it becomes ___a white dwarfa neutron stara brown dwarfa black hole
- 14. Multiple ChoiceAs the core collapses, if a star has more than twenty times the Sun's mass, it becomes ___a white dwarfa neutron stara planetary nebulaa black hole
- 15. Multiple ChoiceThe collapse of a star's core generates vast numbers of elusive subatomic particles called ___neutrinosneutronsphotonsquarks
- 16. Multiple ChoiceWhen the vast wave of neutrinos slams into the oncoming outer material, the explosion is called ___a supernovaa super-astera meganovaa mega-aster
- 17. Multiple ChoiceDuring a supernova, the expanding gas blasts outward at ___2% of the speed of light10% of the speed of light20% of the speed of light40% of the speed of light
- 18. Multiple ChoiceThe Crab Nebula, formed from expanding material, is called ___an open clustera planetary nebulaa supernova remnanta globular cluster
- 19. Multiple ChoiceBetelgeuse will certainly explode some day, but it's ___too far away to hurt ustoo far away to seetoo small to be a supernovatoo small too see
- 20. Multiple ChoiceThe creation of heavy elements during a supernova explosion is called ___explosive amalgamationfusion amalgamationexplosive nucleosynthesisnuclear coalescence
- 21. Multiple ChoiceThe majority of heavy elements in the universe were created and scattered by ___supernovaethe Big Bangplanetary nebulaestar formation
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