(NASA/Goddard Space Flight Center) How do you explore the interior of a planet without ever touching down on it? Start by watching the way the planet spins, then measure how your spacecraft orbits it -- very, very carefully. This is exactly what NASA planetary scientists did, using data from the agency's former mission to Mercury.
from EurekAlert! - Technology, Engineering and Computer Science http://bit.ly/2KJ8xrP
Thursday, April 18, 2019
A closer look at Mercury's spin and gravity reveals the planet's inner solid core
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