I currently live in Seattle and am stably employed with a tech company. I've been thinking about going back for my phd, but the issue is a little complicated. I'm a US citizen and did my MSc in astrophysics at University College London. I've been in touch with my old adviser who would be happy to have me come back for the phd program. When I was there for my masters, I regularly hung out with the phd students and remember there being lots of talks and colloquia that people attended. I guess that the best-case scenario would be me flying out there periodically for face-to-face activities. Has anyone done something like this before? My adviser said he knows someone at a different UK university (Sussex) that did their phd remotely, but they were also in the UK.