The key to finding quasars' distances was
A) planetary nebula in M51.
B) globular clusters in the halo of M87 in Virgo.
C) a Type I supernova in the spiral arm of 3C87.
D) the luminosity of 3C52 from the Doppler shift and the Fisher-Tully relation.
E) the huge redshifts of the hydrogen lines in 3C273.
E
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Which of the following statements about novae is not true?
A) The word nova means "new star" and originally referred to stars that suddenly appeared in the sky, then disappeared again after a few weeks or months. B) When a star system undergoes a nova, it brightens considerably, but not as much as a star system undergoing a supernova. C) Our Sun will probably undergo at least one nova when it becomes a white dwarf about 5 billion years from now. D) A star system that undergoes a nova may have another nova sometime in the future. E) A nova involves fusion taking place on the surface of a white dwarf.
The quantity Z in the expression 
must be
A. always greater than 1. B. always less than 1. C. It could be either greater than or less than 1.
Typically, what color is the Martian sky during the daytime?
A) green B) yellow-brown C) red D) blue
3.00 moles of an ideal gas at a pressure of 250 kPa are held in a container of volume of 25.0 L. The ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K, and 1 atm = 1.01 x 105 Pa
The temperature of this gas is closest to A) 240°C. B) -1.0°C. C) 480°C. D) -180°C. E) -22°C.