Astronomers at the Greenwich Observatory find in the sky a mysterious and totally luminous object. Clarity is so great that our Sun is nothing more than a firefly. Baptized as BR 1202-07, it is located at 12,000 million light-years from Earth. It emits a thousand billion times more light than the Sun. It is a very distant quasi and its light to reach us has had to cross much of the history of the Universe.