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- 1. Multiple ChoiceHow do stars form?through the sunwhen nebula collapses and nuclear fusion occursthrough supernovaMagic
- 2. Multiple ChoiceWhat is the primary element that stars fuse early in their life cycle?HeliumDustHydrogenIron
- 3. Multiple ChoiceWhich of the following would be classified as the beginning of star formation?red dwarfmain sequenceprotostarwhite dwarf
- 4. Multiple ChoiceThe life cycle of a star depends on.massluminosityradiustemperature
- 5. Multiple ChoiceAt what point did our sun form? (What had to happen?)When Helium split into Hydrogen.When Nuclear Fusion of hydrogen into helium beganWhen Nuclear Fission of hydrogen into helium began.When Nuclear Fusion of helium into hydrogen began
- 6. Multiple ChoiceWhat is the first stage of the life cycle of a star for all stars?nebulaprotostarmain-sequencered giant
- 7. Multiple ChoiceThis is a young star that glows as gravity brings it togetherNebulaProtostarMain-sequence starRed giant
- 8. Multiple ChoiceWhat is the biggest difference between a protostar and a main sequence star?Protostars are more massive than main sequence starsProtostars do not engage in nuclear fusionStars spend far longer in the protostar phase than their main sequenceProtostars are hotter than main sequence stars
- 9. Multiple Choice
A stellar nebula is made up of...
clouds of gas
clouds of gas and dust
stars
planets
- 10. Multiple Choice
One of the factors that a large molecular cloud must overcome in order for gravitational contraction to begin is the thermal energy of the gas.
True
False
- 11. Multiple Choice
One trigger that could start the gravitational contraction of a molecular cloud to form stars is a passing shock wave.
True
Falso
- 12. Multiple Choice
When a large gas cloud starts to collapse in a free-fall due to gravity, it will start to cool down as it contracts because of the atoms fall inward.
True
False
- 13. Multiple Choice
One of the major star forming regions in space is the Orion Nebula.
True
False
- 14. Multiple Choice
The temperature at the core of a star must be at least 1 million degrees Kelvin before fusion can begin.
True
False
- 15. Multiple Choice
Low mass stars like the Sun transport energy near their surface using convection.
True
False
- 16. Multiple Choice
Convection is important in stars because it transports energy outward in the star.
True
False
- 17. Multiple Choice
Four of following are factors that must be overcome by a large molecular cloud before gravitational contraction can begin. Which one is the exception?
thermal energy of gas
magnetic fields
rotation of gas clouds
intense radiation from a nearby star
- 18. Multiple Choice
Which trigger could start the gravitational contraction of a molecular cloud?
a faster rotation of the molecular cloud
an intense magnetic field
the collision of molecular clouds
a nearby spectral type G star
- 19. Multiple Choice
When a large gas cloud starts to collapse in a free-fall due to gravity, the cloud will ____.
increase in temperature
decrease in temperature
rotate slower
remain at the same temperature
- 20. Multiple Choice
After a protostar has progressed in its development, it will have a dense inner part and an outer envelope called a(n) ____.
outer-protostar
Bok globules
cocoon nebulae
planetary nebulae
- Answer choicesTagsAnswer choicesTags