I think you're jumping the gun a bit and need to get into the serious study and find out what research is actually being done. Just looking for the 'holes' in the current knowledge is a bad idea imo, as you're only seeing the popular science that reaches the media. The real work doesn't have the gee-whiz factor that would be newsworthy and often doesn't get talked about. I have a younger friend doing a Phd on Xray winds and sources at the moment, and she told me recently that she's found something new and different - the paper on has just been accepted. There is still heaps and heaps of what I would call ongoing regular work to be done (supernova searching, catching gamma ray bursters, calculating orbits, asteroid modeling etc). So just be patient and give it some time. If you're heading to uni you're going to be exposed all sorts of things and one of them might just grab your attention. You never know where you might end up!
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