Which of the following hypothetical observations would contradict current understanding of the nature of white dwarfs?
A) discovery of a white dwarf with a mass of 1.5 MSun
B) discovery of a white dwarf with a surface temperature of 6000 K
C) discovery of a white dwarf at the center of a planetary nebula
D) discovery of a white dwarf with a 1.5 MSun mass main-sequence companion
A) discovery of a white dwarf with a mass of 1.5 MSun
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A) 4 1/2 billion years B) 25 million years C) 10,000 years D) 400 million years
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Proper time interval is the
A. time kept by the observatory in Greenwich, England B. time measured by any observer with a calibrated clock C. elapsed time between two events measured in a frame of reference in which the two events occur at the same time D. elapsed time between two events measured in a frame of reference in which the two events occur at the same point in space