If you have ever closely observed a helicopter, you must have noticed the red and green lights. In fact, these lights are not only present on helicopters but also on commercial and private airplanes.

NASA's Ingenuity helicopter now has more than 100 minutes of Mars flight time under ... Mars helicopter Ingenuity: First aircraft to fly on Red Planet — Perseverance Mars rover snaps amazing ...

Ellie Cook is a Newsweek security and defense reporter based in London, U.K. Her work focuses largely on the Russia-Ukraine war, the U.S. military, weapons systems and emerging technology.

After nearly three years soaring through the red skies of Mars, NASA’s Ingenuity helicopter is permanently grounded. The agency launched the little four-pound chopper in July 2020, with ...