Typical stellar spectra appear as:
A) a series of bright, colored lines.
B) an unbroken rainbow of colors.
C) a rainbow, but with some dark lines mixed in.
D) a rainbow with some bright lines on top of the continuum.
E) a very redshifted rainbow due to the expansion of the universe.
C
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The "top-down" approach to creating artificial life starts
A) in the laboratory with the raw ingredients of life, and seeks to reproduce life in much the same way that it presumably originated billions of years ago B) with a complex organism and then removes cells that are not absolutely necessary C) with existing organisms and genetically strips them down, then tries to rebuild them into new species D) with animal cells and attempts to clone them
In glass, which of the following colors of light travels fastest?
a. red b. blue c. yellow d. All three of the above travel at the same speed.
Which of the following may explain the failure to observe Population III stars?
A. The first stars to be formed in the young Milky Way were very massive and therefore short-lived. B. We do not expect to observe Population III stars, because pure hydrogen and helium stars never formed. C. Population III stars are shrouded by gas and dust, making them difficult to see. D. None of these choices is correct.
Studies of sunquakes, or helioseismology, have revealed that
A) the Sun vibrates only on the surface. B) "sunquakes" are caused by similar processes that create earthquakes on Earth. C) the Sun generates energy by nuclear fusion. D) our mathematical models of the solar interior are fairly accurate. E) neutrinos from the solar core reach the solar surface easily.