A closer look at Mercury's spin and gravity reveals the planet's inner solid core
Wednesday, April 17, 2019 - 11:30
in Astronomy & Space
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.