What is the Fermi Paradox?
A) Galactic civilizations, like ours, seem forbidden by the laws of physics.
B) Interstellar travel is possible yet would take an infinite amount of time because of relativistic time-dilation.
C) Reasonable assumptions predict that a galactic civilization should have already arisen in the Milky Way. Yet, we have absolutely no evidence for it.
D) The Drake equation predicts that there should be no intelligent life in the Milky Way. Yet, we exist.
E) We would be unable to detect an Earth-like planet even at a distance of a few light years.
C
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Radio telescopes are generally ________ than visible-light telescopes.
A) much larger B) much smaller C) much more expensive D) located at much higher altitudes
Science offers final explanations of the universe and its phenomena
Indicate whether the statement is true or false
The point in the phase diagram where the vapor pressure curve ends is called the
A) critical point. B) triple point. C) melting point. D) boiling point. E) double point.
Diffuse reflection occurs when the size of surface irregularities is
A) small compared to the wavelength of the light used. B) large compared to the wavelength of the light used. C) either