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matrenka [14]
3 years ago
10

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

Geography
1 answer:
iragen [17]3 years ago
5 0
<span>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. </span>




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