Speed Of Sound
I take your point, but not sure how relevant it is. This type of programme is not aimed at a mass market; it's average viewing figures are below 1 million, in some cases well below that. Underestimate your audience at your own peril - and they have done at times it would seem. Ryanair will not be the first to sue C4, even ITV themselves threatened to sue them not so long ago.
You don't have to be a rocket scientist to be interested in space travel - it is how you present the information that is a key to its success, not necessarily the information itself.