If a star appears to move back and forth relative to other stars over a six-month period, this motion is due to the star's:
A) transverse motion.
B) radial motion.
C) parallax shift.
D) Doppler shift.
E) true space motion.
C
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Which book was authored by Copernicus that explained the Sun as the center of a planetary system?
a. Alfonsine Tables b. De Revolutionibus c. Stderreus Nunctus d. The Prutenie Tables e. The Forerunner of the Universe, Containing the Mystery of the Universe
Thermal Expansion: A brass rod is 69.5 cm long and an aluminum rod is 49.3 cm long when both rods are at an initial temperature of 0° C. The rods are placed in line with a gap of 1.2 cm between them, as shown in the figure. The distance between the far ends of the rods is maintained at 120.0 cm throughout. The temperature of both rods is raised equally until they are barely in contact. At what temperature does contact occur? The coefficients of linear expansion of brass and aluminum are 2.0 × 10-5 K-1 (brass) and 2.4 × 10-5 K-1 (aluminum). 
A. 470°C B. 440°C C. 420°C D. 490°C E. 510°C
The result of a galactic merger depends on the ________ of each galaxy
Fill in the blank(s) with correct word
Doubling the aperture diameter of a camera lens will change the f-number by what factor?
a. 1/4 b. 1/2 c. 2 d. 4 e. 1/3