Main sequence stars are all about the same radius as the Sun
Indicate whether the statement is true or false
FALSE
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The surface structure of Saturn's largest satellite, Titan, is completely unknown because no spacecraft so far could take pictures through Titan's thick clouds.
A. False, but all information related to Titan's surface comes from radar images taken by the Cassini spacecraft. B. False, recently in 2005, Cassini parachuted a probe into Titan's atmosphere and took the pictures of its surface. C. True, because no probe can pass through Titan's methane and ethane clouds. D. True, because Titan's atmosphere blocks all wavelengths of electromagnetic radiation.
Dark energy is speeding up the expansion of the Universe.
Answer the following statement true (T) or false (F)
Saturn's magnetic field is weaker than Jupiter's because it has less ________
Fill in the blank(s) with correct word
Two balls, A and B, of mass m and 2m respectively, are carried to height h at constant velocity, but B rises twice as fast as A. The work the gravitational force does on B is
a. one quarter the work done on A. b. one half the work done on A. c. the same as the work done on A. d. twice the work done on A. e. four times the work done on A.