The only place outside of Earth where there is irrefutable evidence for (ancient, microbial) life is
A) the Moon.
B) Mars.
C) Europa.
D) Titan.
E) None of the above—there is no irrefutable evidence for life beyond Earth.
E
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To initiate motion, a(n) ______________ force is necessary
Fill in the blank(s) with correct word
Which of the following provides evidence for the existence of dark matter?
A. The orbital speeds of galaxies in clusters are higher than what can be accounted for by the detectable mass of the cluster. B. the ability of rich galaxy clusters to prevent their hot gases from expanding C. The orbital speeds of stars in galaxies are higher than what can be accounted for by the detectable mass in the galaxy. D. All of these choices are correct.
Seyferts are spirals with quasar-like nuclei
Indicate whether the statement is true or false
An egg rests at the bottom of a bowl filled with water. When salt is slowly added to the water the egg rises and floats, from which we conclude
A) salt water is denser than fresh water. B) salt water is denser than an egg. C) both of these D) neither of these