An internationally renowned physicist, Stephen Hawking is still making groundbreaking discoveries at the age of 73.

From his wheelchair and through his dictation device, Hawking outlined his theory for how information can exit a black hole.

According to The Wall Street Journal, Hawking unveiled the theory amid some 30 physicists at a private meeting at the KTH Royal Institute of Technology in Stockholm. Dubbed "Hawking Radiation," the meeting was recorded and a portion was shared online.

"I propose that the information is stored not in the interior of the black hole as one might expect but on its boundary, the event horizon," Hawking said at the meeting, according to the video.

The KTH Royal Institute of Technology also posted a press release to its blog.

"The existence of alternative histories with black holes suggests this might be possible," Hawking said. "The hole would need to be large and if it was rotating it might have a passage to another universe. But you couldn't come back to our universe. So although I'm keen on space flight, I'm not going to try that.

"The message of this lecture is that black holes ain't as black as they are painted. They are not the eternal prisons they were once thought. Things can get out of a black hole both on the outside and possibly come out in another universe."

Hawking detailed how black holes emitted radiation in 1974, The Journal reported, which was a new theory at the time that came to be widely accepted. That theory was then referred to as "Hawking Radiation."

"If you feel you are in a black hole, don't give up," Hawking said at the meeting. "There's a way out."