X-rays and the bare bones of the young universe

When the universe was still in its infancy it was a pretty boring place: there were no stars, no planets, just a whole bunch of gas. When the first stars started to form they were began to change everything. Some of these stars were special because they produced a key ingredient for the universe's evolution: X-rays. Tonight come and see how X-rays have an important role in cosmology and in seeing the bare bones of the young universe.