How did the Hipparcos mission revolutionize our knowledge of stellar properties?
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In space, it had far better resolution than Earth-based telescopes, so could find parallaxes and accurate distances out to 200 parsecs, for almost a million stars. These, in turn, give the luminosities of these stars, critical to helping us understand all other stellar properties as well.
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In which direction does a quarter Moon rise?
A) north B) south C) east D) west E) The Moon becomes a quarter Moon only after it has risen and changed phase.
The diffusion constant for water in air is 
How long would it take a water molecule to diffuse a distance of 10.0 meters?
A. 400 hours B. 450 hours C. 500 hours D. 580 hours E. 600 hours
The inflationary theory of the Universe may explain why the background radiation is so isotropic
a. True b. False Indicate whether the statement is true or false
A combination of 2.0 ? in series with 4.0 ? is connected in parallel with 3.0 ?. What is the equivalent resistance?
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