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Nornagest comments on Rationality Quotes Thread February 2015 - Less Wrong
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There the xkcd comic asking regarding the moon landing: "If NASA were willing to fake great accomplishments, they'd have a second one by now."
It's mean, but given the fake NASA discovery that "expands the definition of life" it's funny. At a time where jokes like that can be made, there's really question where the trust is supposed to come from.
I can easily understand how someone could consider everything NASA (or technologists generally) claims to do as being faked. Everything they claim to do is really hard to verify for almost anyone. And, a lot of it might actually be easier to pull off by faking it – CGI is pretty impressive nowadays and it's not that hard to believe that a lot of images and even video are manipulated or even generated from whole cloth.
If you had to verify, personally, that the ESA actually controlled a spacecraft that orbited a comet, etc., how would you do it? Myself, I accept that I'm really trusting a network of people and that I can't practically verify almost anything I'm told.
Good question. Intercepting the data stream sent back from the spacecraft would probably be possible (direct imaging at that range isn't in the cards), but it would take some rather sensitive equipment. It might be possible to find amateur astronomers who tracked it during its launch or during its flybys of Earth in 2005, 2007, and 2009, though, and derive a trajectory from that; it's not "personal", but if you don't trust that kind of data, you'd be getting far into conspiracy-theory territory.
That'd only get you so far, though. Rosetta's flight plan was pretty complicated and included both several gravity-assist flybys and maneuvers under its own power, so if you doubt ESA's ability to do anything other than get mass near the comet, that'd be tricky to verify.
ETA: Googled "amateur spacecraft tracking" and found a response to almost precisely this question. Turns out there are a few amateur groups with the resources to find the carrier signals from deep-space probes. They even have a Yahoo group.
Great response. You're not fully resolving the potential skepticism I identified, but that's impossible anyways. What should be ultimately convincing is that good theories generate good predictions, and you should expect good theories to be connected to other good theories.
Unfortunately, I think a lot of people are firmly in "conspiracy-theory territory" already and aren't consistently testing their beliefs. I can sympathize because I know I spend a lot of time generating and trusting weak theories about, e.g. other people's motivations, my likely performance on a particular project.