Astronomers have detected a faint glow from the first stars to form in the Universe, Nature journal reports.
This earliest group of stars, called Population III, probably formed from primordial gas less than 200 million years after the Big Bang.
These objects cannot be seen by any present or planned telescopes.
Nasa scientists detected the stars from the imprint they have left on the general glow of infrared radiation dispersed throughout the cosmos.
More: http://news.bbc.co.uk/1/hi/sci/tech/4400672.stm