The celestial equator is
a. a great circle.
b. coplanar with the terrestrial equator.
c. perpendicular to lines of right ascension.
d. all of the above.
d
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Roughly how many stars are within 4 parsecs of the solar system?
A) 3 B) 30 C) 3000 D) 300,000 E) 200 billion
The pink color of the chromosphere is produced by the combined light of three emission lines of hydrogen: ____
a. red, magenta, and violet b. red, blue, and violet c. indigo, blue, and red d. blue, green, and yellow e. green, blue, and violet
Asteroids are believed to be debris left over from the failure of a planet to form at a distance of about 3 AU from the Sun
a. True b. False Indicate whether the statement is true or false
We can best understand how a diver is able to control his rate of rotation while in the air (and thus enter the water in a vertical position) by observing that while in the air
A) his linear momentum is constant. B) his potential energy is constant. C) his kinetic energy is constant. D) his angular momentum is constant. E) his total energy is constant.