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- 1. Multiple Choice
Energy is generated in the cores of stars by fusing ___hydrogen into heliumhelium into hydrogenhydrogen into lithiumhelium into lithium - 2. Multiple ChoiceThe expansion created by the heat of fusion is usually balanced by a star's gravity, creating ___an imbalancea conversionan inversionan equilibrium
- 3. Multiple ChoiceIn gas giants, like Jupiter, the force of gravity is balanced by ___the heat of fusionsimple gas pressuretidal forcescentripetal forces
- 4. Multiple ChoiceThe minimum mass for fusing hydrogen, and becoming a star, is roughly ___twice the mass of Jupiter7 times the mass of Jupiter75 times the mass of Jupiterhalf the mass of the Sun
- 5. Multiple ChoiceStars form from collapsing gas clouds, just like the Sun did ___ years ago4.6 million14.6 million4.6 billion14.6 billion
- 6. Multiple ChoiceObjects with a mass range between the heaviest planets and the lightest stars became known as ___red gnomesbrown gnomesred dwarfsbrown dwarfs
- 7. Multiple ChoiceAstronomers classify stars, using letters, based on their ___temperaturesizeluminositycomposition
- 8. Multiple ChoiceA new cooler class of star, discovered in 1988, was given the letter ___'O''L''F''M'
- 9. Multiple ChoiceWhich element is found in low-mass brown-dwarfs, but not in regular stars?sodiummagnesiumlithiumberyllium
- 10. Multiple ChoiceThe very first true brown dwarf was found in 1995 among a cluster of stars called ___the Pleiadesthe nine sistersHyadesthe Beehive Cluster
- 11. Multiple ChoiceWhich delicate molecule was found in the spectrum of Gliese 229B, the first T dwarf?carbon monoxidecarbon dioxidemethaneammonia
- 12. Multiple ChoiceGliese 229B, the first T dwarf, was one of the first targets of a new camera on ___The Palomar Hale telescopeThe Spitzer Space TelescopeThe James Webb Space TelescopeThe Hubble Space Telescope
- 13. Multiple ChoiceHundreds of brown dwarfs were discovered by NASA's orbiting observatory called the "wide-field ___"analysis survey plotterinfrared perusal explorerinfrared survey explorerinfrared survey performer
- 14. Multiple ChoiceWarm brown dwarfs, that have molecules like methane and water in their atmosphere, probably look ___lilacpurpleredmagenta
- 15. Multiple ChoiceIn WISE images, where astronomers map each infrared color to one our eyes can see, brown dwarfs look ___greenbluewhitered
- 16. Multiple ChoiceAs brown dwarfs get more massive, they ___get smaller and denserget denser, but not biggerget larger and denserget bigger, but not denser
- 17. Multiple ChoiceBrown dwarfs, more than about 13 times Jupiter's mass, can fuse both lithium and ___deuteriumtritiumberylliumboron
- 18. Multiple ChoiceDeuterium is an atom that's very similar to hydrogen except it has ___a proton and a neutron in its nucleustwo neutrons in its nucleustwo protons in its nucleustwo orbiting electrons
- 19. Multiple ChoiceBrown dwarfs are not considered true stars because they don't fuse ___hydrogensiliconlithiumberyllium
- 20. Multiple ChoiceIn 2013, astronomers found a binary pair of brown dwarfs, called Luhman 16, a distance of only ___0.65 light years away6.5 light years away65 light years away650 light years away
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