I'll give it another go though. I think the set up is interesting enough, though I wasn't quite sure where they were going or what exactly their mission was. Even though I missed the first show I wished they had repeated their mission through exposition or something to get latecomers like me up to speed.
The mission seems to be to explore the solar system with the first stop being Venus for some reason (I guess because that's what Beta wants).
Could also have something to with launch windows, planetary alignment and use of planetary gravity to slingshot to the next destination.
I seem to have recall that some of the NASA probes have gone sunwards prior to missions into the outer reaches of the solar system - anyone confirm?