Space.com2 小时
Crater-diving hopper 'Gracie' will launch to the moon aboard private Athena lander this month
The rocket-powered Gracie will conduct five hops during its short lunar stay, including one into the depths of a shadowy ...
The National Interest18 小时
Imperial Japan’s Nakajima Ki-27 “Nate” Was No Match for the Flying Tigers
The Ki-27 was a single-seater, highly maneuverable, fixed-gear airplane, but it was no match for the Flying Tigers. When one ...