Title text:
I'm excited for Dragonfly, because on the list of places in the solar system that I desperately want more pictures from, 'Titan's surface' is right up there at the top with 'Jupiter's atmosphere.'
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3322/
If you do a little homework, these are the worlds with atmospheres, as required for helicopter functions.