This is a worksheet with questions for the episode "Alien Planets" in the Universe series. This video is very good at going through some recent history on discovering planets around other stars, as well as getting into some of the ways that scientists learn more about far away planets. I use this in my high school Earth Science class in our Astronomy unit on exoplanets.
You will receive a PDF file with a 2 page student worksheet ready to be printed, and an 2 page answer key with basic concepts that go along with each question. Students may answer in different words or phrases, but the key gives the idea of the topics covered in that section of the video that go with that question.