![Cassini at Saturn.](https://www.astronomycast.com/wp-content/themes/WhosWho/timthumb.php?src=http://www.astronomycast.com/wp-content/uploads/2010/09/CassiniOrbitsSaturn.jpg&h=150&w=150&zc=1&q=100)
Space missions are expensive to build and launch, so there’s a lot of planning that goes into choosing exactly what’s going to be shot into space. Space scientists and engineers recently went through the process of deciding on their science goals, so we thought we’d spend an episode explaining how this works, and how the next generation of spacecraft and telescopes will be selected.
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