Here's Stephen Hawking's last scientific paper and all about it

The final paper that famed physicist Stephen Hawking worked on before he passed away has been published and it deals with a topic bigger than Hawking's legacy - what happens when objects fall into black holes?

Days before Hawking's death, Perry reportedly called the ailing physicist to give him an update.

Co-author Malcolm Perry said that the information paradox as "at the centre of Hawking's life" for more than 40 years.

The information paradox is a puzzle that comes from the combination of Albert Einstein's theory on general relativity and quantum mechanics.

However, Einstein made important predictions about black holes too, notably that a black hole can be completely defined by only three features: its mass, charge, and spin.

In their work, an outstanding physicist summed up his discoveries about black holes and conservation of information after ingestion of the particles in them. In any case, the principles of the quantum world direct that data is never lost.

In the latest paper, Hawking and his colleagues showed how some of the information may be preserved.

Perry also recounts the last time he spoke to Stephen Hawking about the research they were both working on - it was only a few days before Hawking's death. The great theoretical physicist Stephen Hawking has died on 77-m to year of life, nearly the entire adult life he was confined to a wheelchair. However, he went on to add, "we don't know that Hawking entropy accounts for everything you could possibly throw at a black hole, so this is really a step along the way".

He said, "It was very hard for Stephen to communicate and I was put on a loudspeaker to explain where we had got to". When Perry explained the theory to Hawking, "he simply produced an enormous smile". The classical view of physics regarding black holes told us that nothing, not even light, could escape their grasp. "He knew the final result", Perry told The Guardian. It contains calculations that aim to help solve the "information paradox" that arises when stuff is sucked into a black hole. Since hot articles lose warm into space, a definitive destiny of a dark gap is to dissipate out of presence. Eventually, black holes will evaporate, leaving a vacuum that is the same everywhere else. Entropy is a measure of the number of different ways the microscopic constituents of a black hole can arrange themselves. So it turned out that black holes aren't entirely "black" - they emit "Hawking radiation", consisting of photons, neutrinos, and to a lesser extent all sorts of massive particles.

"This is excellent progress, but we have much work yet to do", Strominger said.