Asked by: Samuel Chaabane, Brighton and Hove
Gravity is easy to manipulate: it’s just a matter of moving masses around. The challenge lies in achieving anything useful by doing it, as gravity is incredibly feeble. Even so, NASA has succeeded many times, by waiting until planets are in specific locations before launching probes, and using the gravity of the planets to hurl the probes to precise locations.
Robert is a science writer and visiting professor of science at Aston University.