In 2032, a rare astronomical event may unfold, as asteroid 2024 YR4 could collide with the Moon, resulting in a once-in-5,000 ...

The STP is a 360-degree steerable propulsion unit which has two similarly-sized propellers, both mounted on a single shaft and rotate in the same direction.

Aerospace Aircraft & Propulsion DARPA: A Sensor-Dominated Future Will Spell The End Of The Stealth Era ...