The phrase "alien spacecraft" refers to a vehicle or object that is believed to come from outer space and is piloted or controlled by beings from another planet or galaxy. Full definition
Loeb and fellow Harvard researcher Manasvi Lingam propose that if alien spacecraft were being propelled by a vast system that converted solar power into energy for laser beams, that system could be twice the size of Earth. (redorbit.com)
When alien spacecrafts invade District 9 - style, it's up to cunning linguist Louise Banks (Amy Adams) to learn their language, communicate, and clearly interpret their intent before the suspicious, trigger - happy «powers that be» attack an unknown entity / possible ally. (nerdlocker.com)