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[Music] mars our planetary neighbor it's very cold and dry and its weak gravity only holds a thin atmosphere as probes started to visit the red planet we gained a more accurate view of the surface and scientists began to wonder mars had once been much warmer it had rivers and in its early years might have sustained life [Music] a succession of new techniques have been deployed trying to unlock the secrets of the red planet and while our knowledge of the martian geology its atmosphere and its weather has grown immensely each new mission to mars raises more questions than it answers we still don't know if mars has at some time been a home to life in 1877 astronomer giovanni chaparrelli made what he thought was the most accurate map of mars yet drawn on it he showed canals in the early 20th century american astronomer percival lowell was convinced the canals were signs of a civilization ex