[Phreaker00]

This seems like a very broad and vague question to me, making it hard to answer or imagine a starting point for your discovery on the subject.

Like many scientific fields these days the breath and depth is immense. Are you looking for a specific niche of astronomy or an overall understanding of the universe? And is that from a human perspective or perhaps a physics perspective?

I would narrow down your interests and start finding relevant sources there. Or, if you don't know, start at a very broad source like space.com or nasa.gov and explore the topics that grab your attention.