I am Dr. John Mather, Nobel Laureate and James Webb Space Telescope Project Scientist, AMA
Hi, I'm John Mather, Project Scientist for the James Webb Space Telescope. I also won the Nobel Prize in Physics in 2006 for measuring the cosmic microwave background radiation, showing it came from the early universe, and discovering that it has hot and cold spots that are responsible for the existence of galaxies, stars, planets, and therefore people. Ask me anything. I'll be answering your questions for about an hour, starting at 1pm EST.
Verification photo: http://www.flickr.com/photos/nasawebbtelescope/8200995434/in/photostream
Edit: Thanks for coming! Enjoyed the questions. Go be scientists too!