August 17
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1877 – Astronomer Asaph Hall discovered Mars' second moon, which he named "Phobos." (He had discovered "Deimos" five days earlier).
1958 – The world's first attempt at lunar orbit, a probe named "Pioneer 0", is launched by the United States, but unfortunately fails.
1970 – Spacecraft "Venera 7" is launched, becoming the first of its kind to successfully transmit data from the surface of another planet - Venus.
