The GE9X engine flew for more than four hours under the wing of a Boeing 747.
The flight has been codenamed "It's Business Time," thanks to social media.
A helicopter lifted it 12,400 feet to test its landing skills.
The discovery of a small, icy world is raising questions about the entire prospect of a ninth planet.
Moscow has been working on missiles to overwhelm defences.
Jeff Bezos is going where no dot-comer has gone before.
Russian Space Command has unveiled four new radar stations, in an effort to rebuild their early-warning network