At a distance of 100 light years to our Sun, these appear only at the weak point as inconspicuous sky. We have already some of its happened in our immediate neighborhood located fixed stars.
1'000 PBq or 1 EBq corresponds to the radioactivity in 10 storage tanks and the high-level waste for 10 years operation of a large nuclear power plant.
Our universe is about 1 trillion seconds or for about 30 billion years there. Because of research results and using the Hubble Space Telescope was the age of about 13.7 billion years the observable universe will be determined.