Physicist Stephen Hawking has teamed up with a Russian billionaire to launch a new quest to discover life on other planets.
The celebrated British scientist has given his backing to Yuri Milner's Breakthrough Initiatives project, which will provide $US100 million ($A135.49 million) over the next decade to those searching for extraterrestrial intelligence.
Milner, an entrepreneur who made his fortune through investments in companies such as Facebook, said he will harness the innovation of Silicon Valley to scan the skies for signs of life, including searching the entire Milky Way and 100 nearby galaxies.
The Breakthrough Listen branch of the project will use the world's finest telescopes to carry out state-of-the-art radio and optical surveys.
Milner called it the "most comprehensive search program ever", and claimed the project would gather more information in one day than in a year of previous research.
Announcing his support for the project, Professor Hawking said: "I am here today because I believe the Breakthrough Initiatives are critically important.
"To understand the universe you must know about atoms. About the forces that bind them, the contours of space and time. The birth and death of stars, the dance of galaxies, the secrets of black holes.
"But that is not enough. These ideas cannot explain everything. They can explain the light of stars, but not the lights that shine from planet Earth.
"To understand these lights you must know about life, about minds. We believe that life arose spontaneously on Earth so in an infinite universe there must be other occurrences of life.
"Somewhere in the cosmos, perhaps, intelligent life may be watching these lights of ours aware of what they mean. Or do our lights wander a lifeless cosmos, unseen beacons announcing that here on our rock, the universe discovered its existence?
"Either way, there is no bigger question."
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