Ingenuity

Ingenuity is a small helicopter that has flown on Mars, even though the Martian atmosphere is only 1% the density of the air in Earth’s atmosphere. It was attached to the underbelly of the Perseverance rover. To fly in the thin atmosphere it is very light (less than 1.8 kg and its blades rotate 3,000 rpms. It's first flight was about 90 seconds. Its lithium-ion batteries supply enough power for 90 second flights.