can't remember the specifics but it was the passage dealing with doppler shift. Passage described info on how the scientists could discern light coming from stars due to this shift. It was really WAY over my head - I thought I had lucked out because one of my last reading topics was on doppler shift. But I had little clue on how to answer their questions. It seemed like the passage blended everything from general chem (they mention how all the hydrogen in the atmosphere of the star is excited?) to physics which made it extra hard for me.
Anyways, that was my impression of the form EH. I joke to myself that's just the form's acronymn for Extra Hard. heh.