Thousands of black holes could uncover secrets

Last updated at 14:20
X-Ray image of space X-ray: NASA/CXC/Penn State/B.Luo et al

This is the deepest X-ray image of the sky ever taken, it took over 7 million seconds, which is almost 3 months, to create with NASA's Chandra X-ray Observatory.

The image, covering an area of sky about the same size as the full moon, shows thousands of supermassive black holes billions of light years away, the highest concentration ever seen.

A black hole is a an area in space where the gravitational pull is so strong that nothing - not even particles or light can escape from inside it.

Scientists are hoping that this information could explain the growth of black holes over billions of years following the Big Bang at the beginning of our universe.