Multiple Choice
Protostars are difficult to observe because
A) the protostar stage is very short.
B) they are surrounded by cocoons of gas and dust.
C) they radiate mainly in the infrared.
D) the protostar stage is very short, they are surrounded by cocoons of gas and dust, and they radiate mainly in the infrared.
E) they are all so far away that the light hasn't reached us yet.
Correct Answer:
Verified
Correct Answer:
Verified
Q126: Which of the following in not a
Q127: _ occurs when most of the material
Q128: Why are reflection nebulae blue in color
Q129: The densest, coldest clouds are called _.<br>A)reflection
Q130: _ is the thermonuclear fusion of hydrogen
Q131: The dust in the interstellar medium can
Q132: _ appear reddish in color due to
Q133: Why is there a lower end to
Q134: Which of the following is a method
Q135: The central cores of which type of