“It looks awfully like an impact flash to my eyes,” wrote Ethan Chappel, an amateur astronomer in Cibolo, Tex., in a recent post sharing a night’s observations of Jupiter at the image-hosting Web site ...

The telescope caught a glimpse of the spacecraft on its way to Jupiter. Gif: Airbus Space Europe’s JUICE mission is on an eight-year journey to the solar system’s largest planet, traveling deep into ...