Astronomer here! AMA!
A little over a year ago, I stumbled into a /r/AskReddit thread to dispel some astronomical misinformation, and before I knew it I was doing my first AMA about astronomy. Since then, I have had the privilege of being "Reddit's astronomer" and sharing my love of astronomy and science on a regular basis with a wide audience. And as part of that, I decided it was high time to post another AMA!
A bit about me: I am a Hungarian-American PhD student in astronomy, currently working in the Netherlands. (I've been living here, PhDing, four years now, and will submit my thesis in late summer 2016.) My interests lie in radio astronomy, specifically with transient radio signals, ie things that turn on and off in the sky instead of being constantly there (as an example of a transient, my first paper was on a black hole that ate a star). My work is with LOFAR- a radio telescope in the eastern Netherlands- specifically on a project where we are trying to image the radio sky every second to look for these transient signals.
In addition to that, I write astronomy articles on a freelance basis for various magazines in the USA, like Discover, Astronomy, and Sky & Telescope. As for non-astronomy hobbies, my shortcut subreddits are /r/travel, /r/lego, /r/CrossStitch, and /r/amateurradio.
Edit: the most popular question so far is asking how to be a professional astronomer. In short, plan to study a lot of math and physics in college, and plan for graduate school. It is competitive, but I find it rewarding and would do it again in a heartbeat. And finally if you want more details, I wrote a much longer post on this here.
Edit 2: 7 hours in, you guys are awesome! But it's late in the Netherlands, and time for bed. I will be back tomorrow to answer more questions, so feel free to post yours still (or wait a few days and then post it, so I won't miss it).