Emission nebulae are also called ____ because they are composed of ionized hydrogen
a. HI regions
b. HII regions
c. Bok globules
d. HeI regions
e. reflection nebulae
B
Physics & Space Science
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Glaciers are thinning in high mountain regions, but there is no evidence of thinning on the Antarctic, Arctic, and Greenland Ice Sheets
What will be an ideal response?
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What happens to a volume of water when its temperature is reduced from 8°C to 4°C?
a. density increases c. density remains constant b. density decreases d. vaporizes
Physics & Space Science
The energy levels in the atom are continuous
What will be an ideal response?
Physics & Space Science
The stars in the halo of our galaxy are
a) not affected by reddening and extinction. b) in a very flat distribution. c) older and bluer than those in the disk. d) never in globular clusters. e) older and redder than those in the disk.
Physics & Space Science