QUESTION 1 10 points The higher the mass of a main sequence star, the and lumino
ID: 108237 • Letter: Q
Question
QUESTION 1 10 points The higher the mass of a main sequence star, the and luminous it is. Colder, more Colder less Hotter, more O Hotter less QUESTION 2 10 points The hydrogen shell fusion supplies most of the energy during the beginning of the giant phase. O True False QUESTION 3 10 points When high-mass stars enter the giant phase, O they increase in luminosity they contract they have a core mostly composed of hydrogen they experience a drop in surface temperature All of the above 10 points QUESTION 4 Observing star clusters will give astronomers needed data for stellar evolution because all the stars are the same age O True FalseExplanation / Answer
1. the higher the mass of a main sequence star, the ____ and _____ luminous it is.
answer- hotter, more
2. the hydrogen shell fusion supplies most of the energy during the beginning of the giant phase.
answer- true
3. when high mass star enters the giant phase.
answer- they increase in luminocity
4. observing star clusters will give astronomers needed data for stellar evolution because all the stars are the same age.
answer- False
5. giant and supergiant stars are rare because they do not form as often as main sequence stars.
answer- False
6. Helium fusion is sometimes referred to as the _______because three helium nucleiare needed to make a carbon nucleus, and because the helium nucleusis called an alpha particle.
answer- Triple alpha process
7. very massive stars have shorter life times than low mass star.
answer- true
8. which trigger could start the gravitational contraction of a molecular cloud.
answer- c) the collision of molecular clouds
9. the proton-proton chain needs a high temperature because the protons must overcome the _______
answer- Coulomb barrier
10. one of the major star forming regionsin space is the orion nebula.
answer- true
11. in a collapsing cloud, gravitational potential energy is converted to heat energy.
answer- true
12. which type of star cluster is strongly gravitationally bound
answer- Globular cluster
13.the period of Cepheid variable is longer than the period off RR Lyrae variable.
answer- true
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