State Kepler's Second Law of Orbital Motion
What will be an ideal response?
Planets sweep out equal area in equal time.
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On the main sequence, almost all stars have radii between about 0.1 and 10 times the Sun
Indicate whether the statement is true or false
Sending signals at optical wavelengths might be a viable alternative to radio wavelengths
A) only between civilizations around solar-type stars whose eyes have evolved to see such radiation B) over relatively short distances where absorption by interstellar matter would not be a problem C) as long as the light transmitted is a different color than the light given off by the parent star D) over all distances as long as the intensity of the signal is strong enough
In the proton-proton cycle, the eventual product is
a. heavy hydrogen. b. tritium. c. helium-3. d. helium-4.
The islands of Hawaii were created by
A) thin continental crust separating and creating a rift valley. B) plumes of hot mantle rising in a hot spot within a plate. C) plates that have slipped sideways relative to each other, creating a fault. D) a plate that has run up against an existing continental plate. E) a fault.