S1W4I1N1G2B3Y4
16 points
SWINGBY is validvalid
a mission in which a spacecraft uses a planet's gravitational pull for making course changes [n SWINGBYS]
a spacecraft mission which uses gravitational pull [n -S]
a mission in which a spacecraft uses a planet's gravitational pull for making course changes [n SWINGBYS]
a spacecraft mission which uses gravitational pull [n -S]