A seven-year, eight-million-kilometer voyage expected to shed light on the mysteries of Mercury, the solar system's least-understood planet, has taken off. CNN's Robyn Curnow reports.
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Sat, 10/20/2018 - 12:46am
A seven-year, eight-million-kilometer voyage expected to shed light on the mysteries of Mercury, the solar system's least-understood planet, has taken off. CNN's Robyn Curnow reports.