Which of the following observations is not a piece of evidence that lends support to aspects of the Big Bang theory?
A) the darkness of the night sky
B) the expansion of the universe
C) the observed helium abundance in the universe
D) the relative motions of galaxies in the Local Group
D) the relative motions of galaxies in the Local Group
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Which of the following statements about planetary nebulas is correct?
A. They expand at a typical rate of 20 kilometers per second. B. They contain flakes of carbon and silicon material. C. Their shape can be very irregular. D. They are shells of glowing gas and dust ejected by dying Sun-like stars. E. All of these choices are correct.
The standard model of particle physics predicts the existence of three families of elementary particles with four particles in each family. All of these particles have been confirmed experimentally except for the tau neutrino. Most physicists think the reason it has not been found is that
A. it likely does not exist. B. it is associated with the tau particle and the tau is difficult to trap. C. no current particle accelerator can generate enough energy to create a tau neutrino. D. neutrinos are very difficult to detect.
Winds on Mars give rise to planet-wide dust storms
Indicate whether the statement is true or false
A quantum is a
a. discrete amount. b. fundamental property. c. unit of momentum. d. proton.