Summary: Welcome to the June 2007 episode of Blueshift, from NASA Goddard Space Flight Center. We're featuring X-ray astronomy this episode - listening to black holes and learning about what it takes to build an X-ray telescope. We interviewed Jerry Bonnell, co-curator of the Astronomy Picture of the Day, for a behind-the-scenes look at the website. We'll wrap things up with a new question from the mailbag, and a brain teaser.
