I'm a PhD student making a poster for a conference. I'd like to include a figure with two images taken by a NASA satellite. Do I need to provide links to the images in the caption, or would it be enough to just give credit for the images in the way that NASA recommends? Below is the current version of the figure; the links are long and make the caption look awkward.
Citing the images is essential. Beyond that, unless the conference has special requirements, nothing is really needed. Give enough of a citation that someone can chase down a link if they really need it. But such links in printed proceedings are unlikely to be followed by more than a small handful of folks.
If the proceedings are online, however, it can be useful to give the link, but not essential. Only proper citation is needed.