The primary evidence that has led astronomers to conclude that the expansion of the universe is accelerating comes from
A) observations of white dwarf supernovae.
B) observations of the speeds of individual galaxies in clusters.
C) measurements of the rotation curve for the universe.
D) measurements of how galaxy speeds away from the Milky Way have increased during the past century.
A) observations of white dwarf supernovae.
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Simon (Ref. 24) says "We have in our ... libraries the technology to feed, clothe, and supply energy to an ever-growing population for the next 7 billion years." Is this a realistic view?
What will be an ideal response?
Pluto's composition is most similar to that of a
A) terrestrial planet. B) comet. C) star. D) jovian planet.
Lake Superior has a shoreline of length 2726 miles. What would be its area in 
if it were a perfectly circular lake? One mile is 1.609 km.
A. 
B. 
C. 
D. 
E. 
F. 
An electron has a kinetic energy that is twice its rest energy. Determine its speed.
A. 0.76c B. 0.81c C. 0.94c D. 0.54c E. 0.87c