NASA’S MARS HELICOPTER COMPLETES FLIGHT TESTING.
While the United States, Soviet, European, Chinese, Indian and Japanese space agencies have landed spacecraft on an array of planets, asteroids and comets, none have flown in the skies above those worlds—but that may soon change.
If everything goes as currently planned, when NASA’s Mars 2020 rover arrives at the Red Planet in February 2021 it will carry with it a technological first—a helicopter designed to fly in the thin Martian atmosphere.
In late January 2019, engineers at NASA’s Jet Propulsion Laboratory (JPL) tested the flight model of the Mars Helicopter under conditions similar to those it is expected to face on the planet’s surface, where nighttime temperatures can be as low as minus 130 degrees Fahrenheit (minus 90 degrees Celsius).
https://www.spaceflightinsider.com/missions/solar-system/nasas-mars-helicopter-completes-flight-testing/