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czert2 -> 1977 unique 4 planetary mission (6/27/2015 9:56:22 AM)
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just watched documentary in which they told that in this year was posible this unigue missin (once per 149 years iirc) - and that you will lauch probe whch will fly around all 4 outer planets, and main goal was to send probe to uranus - using of gravity pull to modify probe fly trajectory.
and this comed to my mind - in old baris mission to some planets were avaivable only during certain time (for fuel efficiency)- but cant recall anything simmiliar in this new baris.
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