Pluto's mass was poorly known before 1978. What happened in that year to change this?
A) The Hubble Space Telescope was launched.
B) The new Keck telescopes became operational.
C) Charon was discovered.
D) The return echo of a radar pulse, sent many years before, returned to Earth allowing a Doppler shift measurement of its rotation rate.
Correct Answer:
Verified
Q11: How was the dwarf planet Pluto discovered?
A)
Q12: The Pluto-Charon system moves in which way
Q13: Pluto is believed to have
A) no atmosphere
Q14: Pluto was discovered in
A) 1930.
B) 1846.
C) 1609.
D)
Q15: Pluto is NOT believed to have an
Q17: What technique allowed scientists to determine accurately,
Q18: Some of the definitions of the different
Q19: How often would an observer standing on
Q20: Which of these objects was discovered during
Q21: The size of the largest asteroid, Ceres,
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