The extragalactic background light (EBL) that permeates the Universe in the optical-IR is essentially an integral of the light produced from the time the first stars were formed in our Universe until now. As such, it is a quantity that is very closely connected to the galaxy/ large scale structure formation in our Universe. Unfortunately, measuring the EBL has been proven practically impossible, for very simple reasons that I will discuss in the first part of my talk. Luckily, we found an unexpected, parameter-free way to break the deadlock of measuring the EBL with GLAST, NASA's new gamma-ray satellite. This will be the second part of my talk. GLAST measurements are underway and the determination will take about two years.

Location: Physics Bldg., Room 401
Coffee: 3:15 p.m.