An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
C
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The most common aromatic hydrocarbon is a clear, colorless liquid named
a. naphthalene. b. hexane. c. benzene. d. ethanol. e. methane.
It is desired to project an image of an object four times actual size with a lens of focal length 20 cm. What object distance should be used?
A) 100 cm B) 80 cm C) 4 cm D) 25 cm E) 5 cm
Protostars are difficult to observe because
a. the protostar stage is very short. b. they are surrounded by cocoons of gas and dust. c. they radiate mainly in the infrared. d. the protostar stage is very short, they are surrounded by cocoons of gas and dust, and they radiate mainly in the infrared. e. they are all so far away that the light hasn't reached us yet.
The factor fnow, in the Drake equation depends on
A) whether a civilization ever develops intelligence B) whether a planet has any kind of life on its surface right now C) how technologically advanced civilizations become D) how long civilizations survive once they have arisen