In principle, the Drake equation should enable us to calculate the exact number of intelligent civilizations capable of interstellar communication in our galaxy right now. However, currently this is not feasible because
A) we do not have exact numbers for any of the factors in the equation
B) it is impossible for us to ever know the values of any of the factors
C) we have exact numbers for the first three factors, but not the last factor
D) we have an exact number for the first factor, but not for any of the other factors
A
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The amount of light received at Earth from a star is called luminosity
a. True b. False Indicate whether the statement is true or false
What is the common trait of all main-sequence stars?
A) They generate energy through hydrogen fusion in their core. B) They are in the final stage of their lives. C) They are all spectral type G. D) They all have approximately the same mass.
To hold a 5 lb bag of sugar in your hand, you must push upwards on it with a force of 5 lb. This is an example of Newton's third law
a. True b. False Indicate whether the statement is true or false
How far does a beam of light travel in 2.0 ms? (c = 3.0 × 108 m/s)
A) 6.0 × 105 m B) 0.66 × 105 m C) 90 m D) 70 m E) 60 m