What happens to the visible light radiated by stars located within a dusty gas cloud?
A) It is blocked by dust and its energy is thereby lost.
B) It is absorbed by dust, which heats the dust grains so that they emit the absorbed energy as infrared light.
C) It is reflected by dust back to the star from whence it came.
D) It passes through the cloud unaffected.
Question 2
When a comet passes near the Sun, part of it takes on the appearance of a large, bright ball from which the tail extends. This part is called
A) the nucleus.
B) the coma.
C) the plasma tail.
D) the Oort core.
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