(Couldn't resist this meme)
I work at a school for people who have finished high school and want to learn more. People take classes from me to learn how and why things in space and on the ground move the way they do. Last fall, my students learned how balls move when you throw them, using numbers. Now my students (different students from last fall) are learning about worlds around other stars. Outside classes, I study how worlds form around other stars. I use great big computers to study this. Worlds form out of stuff left behind from when the star formed. You can see this stuff around young stars when you look at them with things that can see far. Sometimes you can see a world hiding in the stuff, too.
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http://splasho.com/upgoer5/)