How many arcseconds are in 1°?
A) 60
B) 360
C) 3,600
D) 100
E) 10,000
C
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Which of the following happened first (after the Big Bang)?
A) Molecules formed. B) Neutral atoms formed. C) Protons formed. D) Helium formed.
Name four properties of Mars that are similar to those of Earth today.
a. Magnetic field; average density; atmospheric chemical composition; active water erosion of the surface. b. Differentiated body; location in the Solar System; has weather and seasons; surface temperatures can be Earthlike. c. Differentiated body; location in the Solar System; atmospheric chemical composition; active water erosion of surface. d. Magnetic field; average density; has weather and seasons; surface temperatures can be Earthlike.
Which of the following is the most precise method for measuring the mass of a galaxy?
A) The parallax method B) The rotation curve method C) The visual field test D) Colorimetry
Estimate the number of times Earth will rotate on its axis during a human's lifetime
A) 3 × 104 B) 3 × 105 C) 3 × 106 D) 3 × 107 E) 3 x 108