In ancient times, constellation boundaries were well defined
a. True
b. False
Indicate whether the statement is true or false
False
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Inelastic Collisions: In an inelastic collision involving an isolated system, the final total momentum is
A. exactly the same as the initial momentum. B. more than the initial momentum. C. less than the initial momentum.
Which planet could an astronaut visit without the need for a spacesuit (and survive)?
A) the Moon B) Mars C) Mercury D) Venus E) None; an astronaut would need a spacesuit to survive a visit to any other planet in the solar system.
How is the atmosphere of a planet affected by the rotation rate?
A) Faster rotation rates raise the atmospheric temperature. B) The rotation rate determines how long the planet is able to retain its atmosphere. C) The rotation rate determines how much atmosphere a planet has. D) Faster rotation rates produce stronger winds. E) Faster rotation rates raise surface temperatures and thus determine how much material is gaseous versus icy or liquid.
The text states that luminous matter in the Milky Way seems to be much like the tip of an iceberg. This refers to the idea that ________
A) black holes are much more interesting than ordinary stars that give off light B) luminous matter emits white light, much like the light reflected from icebergs C) the luminous matter of the Milky Way is essentially floating on the surface of a great sea of dark matter D) dark matter represents much more mass and extends much further from the galactic center than the visible stars of the Milky Way