Venus orbits the Sun in 225 days. How long does it take to rotate on its axis?
A) 225 days, so it keeps the same face toward the Sun
B) 24 hours, 36 minutes, very similar to Earth and Mars
C) 243 days, even though the Earth's tidal pull is not involved
D) 36 days, for reasons unknown
E) 450 days, exactly at 2:1 spin-orbit resonance
C
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Within Earth's atmosphere, in which layer does convection occur?
A) the troposphere B) the stratosphere C) the mesosphere D) the ionosphere E) Convection occurs in all layers of Earth's atmosphere.
Since Mars is 1.5 AU from the Sun, how long would it take for sunlight to reach the surface of Mars?
a. 4 min b. 8 min c. 12 min d. 1 hr e. 4 hr
What happens during the apparent retrograde motion of a planet?
A) The planet appears to move eastward with respect to the stars over a period of many nights. B) The planet moves through constellations that are not part of the zodiac. C) The planet rises in the west and sets in the east. D) The planet moves backward in its orbit around the Sun. E) The planet moves backward through the sky.
The water hole is a radio region with lower background noise
Indicate whether the statement is true or false