Gravity lensing lets us map the distribution of both visible and dark matter
Indicate whether the statement is true or false
TRUE
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Why does the Moon lack an atmosphere?
What will be an ideal response?
The stars farther than 20 000 LY from the center of the Milky Way are traveling too fast to be bound to the galaxy by the observed mass of the galaxy. Which of the following are currently being investigated as possible explanations of this?
a. neutrino mass b. WIMPs c. Newtonian dynamics are not quite correct. d. all of the above
Modern scientific theories are NOT:
A) testable. B) continuously tested. C) simple. D) perfect. E) elegant.
In the general theory of relativity, a gravitational field:
a. does NOT have any effect on how time passes. b. does NOT have any effect on space. c. makes clocks run faster. d. can be replaced by warped spacetime. e. is locally equivalent to being at rest in an inertial reference system.