A breakthrough study has revealed why emerging electric aircraft engine technology sounds so annoying -- and how to fix it.

The U.S. Space Force is keen to add to its arsenal a spacecraft that would essentially serve as the cosmic equivalent of an aircraft carrier ... "pre-positioned launch pad in space" that would ...

The U.S. Space Force is keen to add to its arsenal a spacecraft that would essentially serve as the cosmic equivalent of an aircraft carrier ... referred to the carrier as a "pre-positioned launch pad ...