Vishal Gajjar is part of the team working under the Breakthrough Listen project - set up by Hawking, one of the world's best-known scientists, and Russian billionaire Yuri Milner - to discover the truth about the universe.
The latest fast radio bursts (FRBs) prove their equipment is working well and ready to pick up signs of life if they exist.
"We really have no idea about where they come from," Gajjar, one of the scientists from the University of California Berkeley Research Centre, told The Daily Telegraph.
"There are more theories than the number of sources. We have opened more questions than answers. As we do more study we find more weird things," he said.
Breakthrough Listen is a USD 100-million global astronomical initiative launched in 2015 by Hawking and Miller and has teams around the world using their telescopes to look for evidence of life.
The initial 10-year programme will survey the 1,000,000 closest stars to Earth, scanning the entire galactic plane of the Milky Way.
Announcing the project at the time at a press conference in London, Hawking said it was time to commit to finding the answer to life beyond Earth.
"Somewhere in the universe intelligent life may be watching the lights of ours aware of what they mean," he said.
Explanations for the latest signals detected range from rotating neutron stars with extremely magnetic fields, to energy sources used by extraterrestrial civilisations to power spacecraft.
Whatever they are they left their galaxy when our Solar System was just two billion years old and life was just getting going on Earth.
In the fresh experiment, which will be elaborated upon in scientific journals in future, University of California, Berkeley, experts scanned the same galaxy at a higher frequency than which had been used to see the original bursts, and found 15 more.
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