EditorialIn an undated photo from JPL-Caltech/NASA, from left, Teddy Tzanetos, a roboticist at the NASA Jet Propulsion Laboratory; MiMi Aung, the Mars Helicopter's project manager; and Bob Balaram, its chief engineer; observe a test flight at NASA's Jet Propulsion Laboratory in Pasadena, Calif., Jan. 18, 2019. (JPL-Caltech/NASA via The New York Times)