NASA "lost" its Martian helicopter for two days and was already preparing for the worst, but a miracle happened
Mars rover Perseverance could not pick up a signal from Ingenuity for two days
The strange phenomenon was observed by NASA's Mars Reconnaissance Orbiter spacecraft
NASA's total investment in development was almost a billion dollars
InSight helps Earth scientists to reveal the secret of Mars' "insides"
Studying earthquakes on Mars may help safe human settlement