What temperature has the Big Bang has cooled to by now?
A) About 3,000 K
B) 5,800 K
C) About 300 K
D) Just over 2.7K
E) 1.4 K
D
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Gravitational lensing is caused by ____
a. refraction of light through hot intracluster gas b. stimulated emission of light passing through dark matter c. acceleration of photons by supermassive black holes d. scattering of photons off of thin intergalactic dust e. bending of light rays due to the curvature of space-time around a mass
What is a star's luminosity?
A) the apparent brightness of the star in our sky B) the surface temperature of the star C) the lifetime of the star D) the total energy that the star radiates each second
The force on a charged object divided by the charge on the object is
a. voltage. b. current. c. resistance. d. electric field. e. critical temperature.
Which of the following statements about the celestial equator is true at all latitudes?
A) It extends from your horizon due north, through your zenith, to your horizon due south. B) It cuts the dome of your local sky exactly in half. C) It represents an extension of Earth's equator onto the celestial sphere. D) It lies along the band of light we call the Milky Way. E) It extends from your horizon due east, through your zenith, to your horizon due west.