Short wavelength radiant energy is emitted by
A) relatively cooler sources, like Earth.
B) relatively cooler sources, like the Moon.
C) relatively hotter sources, like the Sun.
D) none of the above
Question 2
If Earth is closest to the Sun in January, why is much of the Northern Hemisphere cold in January?
A) It is cold because it is winter.
B) The Southern Hemisphere is tilted away from the Sun in January.
C) Solar energy favors the equatorial regions.
D) The Northern Hemisphere is tilted away from the Sun in January.