user: What is the CGRO that detects photons?

assistant: The CGRO is the Compton Gamma Ray Observatory (CGRO) and was a space observatory detecting photons with energies from 20 keV to 30GeV in earth from 1991 to 2000.

user: Did the dome last as long as it was designed for?

assistant: No, it did not. The dome only lasted 13 years, but it was designed to last 15-20 years.

user: What is the population density of Germany?

assistant: The population density of Germany is over 235 people per square kilometer, or over 600 people per square mile