A key feature of the theory of chaos is
A) unpredictability.
B) very small initial differences can lead to very large eventual differences.
C) the randomness of molecular motion makes prediction difficult.
D) even orderly systems are seen to be disorderly when carefully studied.
Answer: B
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Match the words at the left to the correct blanks in the sentences at right. Use each choice only once.
A. A camera is an example of an instrument used for _________observations. B. _________ refers to telescopic observations in which we separate an object's light so we can measure its intensity at different wavelengths. C. If we want to confirm that a star's brightness alternately dims and brightens, we need __________ observations of the star. D. The familiar twinkling of the stars is caused by _____________, which also blurs telescopic images. E. Human civilization is responsible for what astronomers call ____________.
Studies by the Global Oscillations Network Group, along with satellite observations, indicate
A) that the standard solar model requires substantial modification. B) that all stars show the same kind of vibrations that our Sun does. C) that there is an unknown energy transport mechanism in the Sun. D) that there is less convection in the Sun than predicted by the standard solar model. E) that the standard solar model accurately models the observed solar vibrations.
Which of the following types of molecule is the most abundant in an interstellar molecular cloud?
A) CO B) H2O C) H2 D) NH3
If astronauts could travel at v = 0.90c, we on Earth would say it takes (4.2/0.90) = 4.7 years to reach Alpha Centauri, 4.2 lightyears away. The astronauts disagree. How much time passes on the astronaut's clocks?
a. 2.0 years c. 1.4 years b. 2.4 years d. 3.0 years