One of the biggest problems facing astronomers is that they are Earth based and can not travel with anything besides their eyes and high powered telescopes through space to the stars and planets they study. More advances are being made every day, however, and by the time space travel becomes common our astronomers will have armed us with a wealth of knowledge.
Gravity.
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they faced a brief ice age
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People in Pakistan face things like corruption, no electricity, no gas, no jobs, and so on.
Low wages and dangerous working conditions
specifically, "astronomers" that study black holes are called cosmologists.
They were accompanied by persons who created a writting description of whatever they had seen.
Knowing that in the future humans would not use proper grammar nor willing enough to read in their book to find out what kind of problems he would face and choose to go on the Internet to Anwsers.com