moore7906 moore7906
  • 23-06-2018
  • Geography
contestada

Pluto's mass was poorly known before 1978. what happened in that year to change this

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Diatonic254
Diatonic254 Diatonic254
  • 03-07-2018
The answer is ‘The return echo of a radar pulse, sent many years before, returned to Earth allowing a Doppler shift measurement of its rotation rate’.  This allowed the astronomers to  calculate its centripetal force hence able to derive force by using the law of universal gravitation.




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