The number of planets outside the solar system thus far detected is
A) about 20.
B) about 100.
C) several thousand.
D) several million.
Correct Answer:
Verified
Q36: The galaxies in the universe are distributed
A)
Q37: Primary cosmic rays are produced
A) in the
Q38: In the universe today there
A) seems to
Q39: Primary cosmic rays consist of
A) atomic nuclei,
Q40: Dark energy
A) is the energy equivalent of
Q42: The heavy elements in the earth were
Q43: Communications with planets outside the solar system
Q44: Nearly all the helium in the universe
Q45: Planetary systems are probably
A) very rare in
Q46: Studies of the cosmic background radiation suggest
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