Why do astronomers suspect there may be a ninth planet beyond Neptune?
A. The Kuiper Belt is not in the expected position.
B. Pluto has more moons than it should.
C. Several Trans-Neptunian Objects have elongated orbits yet are all currently closest to the Sun.
D. Neptune's orbit extends closer to the Sun than expected.
Answer: C
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Neutron stars were first discovered in the 1930's
a. True b. False Indicate whether the statement is true or false
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What will be an ideal response?
The Pliocene is a(n)
a. epoch. b. era. c. eon. d. period.