Astronomers recently discovered five supermassive black holes that were earlier hidden in the dust clouds. Astronomers suggest that several millions of these gigantic concealed monster black holes exist in the universe.

The team led by astronomers at Durham University, UK, used NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) satellite observatory to detect the high-energy x-rays from these five massive black holes.

The team pointed the NuSTAR at nine candidate hidden supermassive black holes that were earlier thought to be extremely active at the center of galaxies. Researchers associated with the research stated that the high-energy x-rays found in five of the black holes confirmed that they were earlier hidden by dust and gas clouds.

Researchers noted that these five massive black holes appeared far brighter and more attractive than previously thought. They were also emitting large amounts of radiations, said researchers.

Lead author George Lansbury, said, "For a long time we have known about supermassive black holes that are not obscured by dust and gas, but we suspected that many more were hidden from our view".

He further thanked NuSTAR saying that it was the first time when they were able to clearly see those hidden monsters that were previously not visible as they were in their 'buried state'.

So far, they were successful in detecting only five of these hidden black holes, but they hope that when they will extrapolate their results across the entire universe, the predicted numbers might increase to a much higher.

The team presented their findings at the Royal Astronomical Society's National Astronomy Meeting, in Llandudno, Wales.