Spiral galaxies are mostly found ____
a. in poor clusters where their disk structure will not be disrupted
b. isolated in space with only small dwarf galaxies nearby
c. in the center of rich clusters where tidal forces can support their arm structure
d. in clusters with hot intergalactic gas helping support star formation
e. orbiting giant elliptical galaxies in a galactic binary system
a
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Why does the atmosphere of Saturn appear to have only half the helium content of Jupiter?
A) Because Saturn is so much colder, helium does not show up as strongly in its spectrum. B) Saturn was formed farther from the helium rich Sun. C) A red dwarf, Jupiter has fused some of its hydrogen into helium, whereas Saturn, a colder planet, has not. D) Much of Saturn's helium has differentiated towards its center. E) Much of Saturn's helium has reacted with water and formed helium oxide.
Rocks that formed from the cooling of molten material are classified as
a. discordant. b. metamorphic. c. sedimentary. d. igneous.
A mirror must be ________ in shape to reflect the light back to a focus
Fill in the blank(s) with correct word
A block of ice sliding down an incline has one-quarter its maximum potential energy
A) one-quarter from the top. B) one-quarter from the bottom. C) three-quarters the way down. D) need more information