34.What is the main cause of a molecular cloud to collapse and form a star? Sele

Question

34.What is the main cause of a molecular cloud to collapse and form a star? Select one:

a. gravity

b. supernovae

c. winds

d. molecular clouds

35.Rank from lowest to highest the final state of a star based on the original mass of the star. Select one:

a. Neutron Star, White Dwarf, Black hole

b. Neutron Star, Black hole, White Dwarf

c. White Dwarf, Neutron Star, Black hole

d. Black hole, White Dwarf, Neutron Star

e. Red Giant, Super-red Giant, Super-blue Giant

36.For every >10 solar mass star, how many low-mass stars are there? Select one:

a. 0.004

b. impossible to know since the Galaxy is so big

c. 1

d. 250

37.Using stellar spectral classes, not including the cool red dwarfs, what is the hottest and coolest main sequence star? Select one:

a. A / F

b. B / G

c. G/ K

d. O/ B

e. O / M

39. What supports a White Dwarf from collapsing? Select one:

a. electron degeneracy

b. neutron degeneracy

c. atom degeneracy

d. degeneracy

40.If there are two stars of the same surface temperature, but one is bigger than the other, which one is more luminous? Select one:

a. The smaller one is more luminous.

b. Unable to tell with these data.

c. They are the same temperature, so the same brightness.

d. The bigger one is more luminous.

Your astronomer friend observes the below spectrum. What is the source? Select one: O a. The Sun's photosphere O b. A hot nebula O c. A Star O d. A white dwarf

Explanation / Answer

34.What is the main cause of a molecular cloud to collapse and form a star? Sele

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