Which of the following is TRUE?
A) The center of the universe is located at a point about 200 Mpc from us in the center of a cluster of galaxies.
B) We measure a redshift for roughly half of the galaxies that we observe, and for the others we measure a blueshift.
C) It is possible for galaxies that are very distant to actually move through space at a speed several times the speed of light.
D) A redshift occurs when a photon loses energy and slows down as it moves through space.
E) We see distant galaxies as they were billions or even tens of billions of years ago.
Ans: E) We see distant galaxies as they were billions or even tens of billions of years ago.
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Suppose you stand on a weighing scale and all of a sudden the atmosphere vanishes. The reading on the scale would
A) increase. B) decrease. C) remain the same.
The shell model is an example of a
A) physical model. B) conceptual model. C) both a physical and conceptual model. D) None of the above.
The process of formation of the Solar System
a) involved the Sun forming from the collapse of a large planet. b) began about 10 million years ago. c) led to the formation of the most massive planets closest to the Sun and the least massivefarthest away. d) involved a spinning cloud of gas that remained spherical until after the planets andSun formed. e) took only a small fraction of the age of the Solar System.
A glance at the speedometer on your vehicle will tell you your
A) average speed. B) instantaneous speed. C) overall speed. D) acceleration.