Space Policy Edition: Why are outer planets missions so expensive?
Planetary Radio: Space Exploration, Astronomy and Science
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The Grand Tour of the Solar System
The idea of the grand tour was just something that had been bandied about nassa, which forle for tos know what that is. The planets of the outer solar system were going to be lined up in their orbits in such a way that one spacecraft could essentially visit them all using gravity assists. That's a once in a lifetime opportunity. You have to take that when it comes or you miss it. At this point, nassa started to shift more towards rabotics, but their big mission was viking.
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