In 2003, the UK space agency sent a lander to Mars called Beagle-2. It made it there, but never made radio contact. The scientists assumed that the lander was obliterated after a harder-than-planned landing.

Beagle-2 has now been spotted on the surface by NASA's Mars Reconnaissance Orbiter, and photos show that it is still in one piece. A likely explanation for its silence is that the radio antenna never deployed, leaving us in the dark about its nearly-successful landing until now.