During the time that a planet is in its period of apparent retrograde motion,
A) the planet moves backwards (clockwise as viewed from above Earth's north pole) in its orbit of the Sun.
B) the planet appears to rise in the west and set in the east, rather than the usual rising in the east and setting in the west.
C) over many days or weeks, the planet moves westward relative to the stars, rather than the usual eastward relative to the stars.
D) the planet is getting closer to the Sun in its orbit.
C
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Which of the following best describes the orbital resonance shared by Io, Europa, and Ganymede?
A) Io completes four orbits in the same time it takes Europa to complete two orbits and Ganymede to complete one orbit. B) Io, Europa, and Ganymede each have the same orbital period around Jupiter. C) Io, Europa, and Ganymede all show the same face to Jupiter at all times. D) Io, Europa, and Ganymede are always oriented in a straight line.
The greatest rift valley system yet found is ________ on Mars
Fill in the blank(s) with correct word
Radiant energy from the Sun is composed of shorter wavelengths than radiation from the Earth because the Sun
A) has much more thermal energy. B) has a higher temperature than the Earth. C) is an energy source while the Earth is primarily an energy receiver. D) none of the above
A diver shines an underwater searchlight at the surface of a pond (n = 1.33). At what angle (relative to the surface) will the light be totally reflected?
a. 47.3° b. 41.2° c. 51.1° d. 58.7° e. 49.8°