I think there are too many to count, and the opportunities are endless! It is only in the last few years that analysing the dirt found on mars became a new field of science, so give it about 5 years, and who knows what we could be studying next!
I think you can think of science as a whole like a tree! You have the larger branches representing very broad areas like physics, biology, chemistry, then coming off those you have hundreds more as you become more and more specific. A new advancement might lead to a new branch which in turn leads to lots of other smaller branches too! So yeah, I think the possibilities are more or less endless!
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