Oooh this is a tough one. I guess my favourite things in space are active galactic nuclei because those are what I study. They are some of the most extreme objects in the universe and were once called “nature’s death ray guns” in a news article which I think is really cool! You can find out more about them in my profile or I answered a question about them here: /cobaltj11-zone/2011/06/what-are-the-galatic-nuclei-made-up-of
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