How big is it?
Friend of mine thinks this is a photo taken in a studio or something. What can I say to make her realize this is real?
Please, no pessimism. Looking for actual answers.
Dimensions
3.5×4 km (2.2×2.5 mi)
Source: http://en.wikipedia.org/wiki/67P/Churyumov%E2%80%93Gerasimenko
As for how to convince her, I just don’t know.
Maybe one way is to suggest to her that there isn’t any reason to fake it.