Which of these objects was discovered during the twentieth century?
A) Pluto
B) Uranus
C) Neptune
D) Ceres
Correct Answer:
Verified
Q15: Pluto is NOT believed to have an
Q16: Pluto's mass was poorly known before 1978.
Q17: What technique allowed scientists to determine accurately,
Q18: Some of the definitions of the different
Q19: How often would an observer standing on
Q21: The size of the largest asteroid, Ceres,
Q22: Haumea is classified as a dwarf planet
Q23: On New Year's Day, 1801, Giuseppe Piazzi
Q24: What is a trans-Neptunian object?
A) a solar
Q25: What is the largest known asteroid in
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