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H II region: Quiz


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Question 1: [2] Magnetic fields are produced by moving electric charges in the plasma, suggesting that H II regions also contain ________.
Maxwell's equationsElectromagnetismElectric fieldLorentz force

Question 2: Examples include the 30 Doradus region in the ________ and NGC 604 in the Triangulum Galaxy.
Draco DwarfSmall Magellanic CloudLarge Magellanic CloudLeo I (dwarf galaxy)

Question 3: H II regions are named for the large amount of ionised ________ hydrogen they contain, referred to as H II by astronomers (H I region being neutral atomic hydrogen, and H2 being molecular hydrogen).

Question 4: [4] The brightest of these was at a wavelength of 500.7 nanometres, which did not correspond with a line of any known ________.
HydrogenChemical elementCarbonHelium

Question 5: They range in size from so-called ultra-compact regions perhaps only a ________ or less across, to giant H II regions several hundred light-years across.
Light-yearCosmic distance ladderParsecAstronomical unit

Question 6: Young, hot, blue stars which have formed from the gas emit copious amounts of ________ light, ionizing and heating the gas surrounding them.
Electromagnetic spectrumVisible spectrumX-rayUltraviolet

Question 7: [2] They are mostly ionised, and the ionised gas (plasma) can contain ________ with strengths of several nanoteslas.
Magnetic momentMagnetic fieldMaxwell's equationsMagnetism

Question 8: It contains around 200 hot OB and Wolf-Rayet stars, which heat the gas inside it to millions of degrees producing the bright ________ emissions.
Nuclear fusionRadiation therapyX-rayIonizing radiation

Question 9: Measuring at about 200 pc (650 light years) this nebula is the most massive and second largest H II region in the ________.
Milky WayOrion ArmLocal GroupVirgo Supercluster

Question 10: However, none seem to have been noticed before the advent of the ________ in the early 17th century.
AstronomyReflecting telescopeOptical telescopeTelescope


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