He's not even sure we will know them when we see them. Prof Sasselov, an astrophysicist, thinks that if life exists elsewhere - and he believes it does - it will probably be based on diverse building blocks than ours, and so may possibly not even be recognisable as life.
A project he is heading at Harvard University, known as the Origins of Life, is making an attempt to envision what life would be like if it ended up based mostly on various chemical substances, conditions and historical past than we have on Earth. You will find no purpose life can only type beneath our set of conditions, he claims - or at least which is what he thinks and hopes the project will eventually demonstrate.
Men and women have been inquiring queries like "How did we get the following?" and "Are we by yourself?" since the time of Epicurus, close to 300 BC, if not earlier. And Sasselov states we probably will not likely have a definitive answer in the next century both.
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But new resources and new data in a assortment of fields are enabling researchers to get nearer to individuals solutions than they actually have prior to. And key, interdisciplinary efforts like Harvard's Origins of Life project, and similar kinds at Arizona State University, the College of Washington, and University Higher education London (which is keeping its first symposium on the subject on eleven November), are radically modifying the way we search - and what we are possible to uncover.
Just as Copernicus revolutionised how people seen themselves and their entire world 450 years ago, and Darwin did once again 150 years in the past, so Sasselov says we are obtaining close to another transformative minute.
"One early morning we will wake up with a fundamentally diverse watch of the planet and who we are," he states.
Are we on your own? This is a fertile time to be seeking for life on other planets.
The Kepler Space Telescope, launched by US space agency NASA in March 2009, has noticed hundreds of planets with Earth-like qualities. This finding has energised the discipline of planetary scientists if Earth-like planets are common, then it is a lot more realistic to assume that life could be, as well, says Prof Sasselov, whose book on the subject matter "The Life of Super-Earths" is because of out in January.
He is now aiding NASA style the subsequent set of experiments for Kepler, as properly as a up coming-era telescope.
Kepler's area of see is only about as large as a hand stretched up towards the summertime evening sky, fingers splayed. The land-primarily based telescope Prof Sasselov envisions could assist experts scan a broader swath, figuring out the closest hospitable planets.
Searching for origins There may be life out there... but not as we know it
The red and green lasers that Sasselov and his workforce pulse in the basement of the Harvard-Smithsonian Center for Astrophysics enable them to determine wavelength shifts that show a planet's chemical make-up. Sasselov compares it to utilizing a GPS system, though instead of figuring out the planet's position in space, the lasers expose its placement in frequency.
But it will consider a good deal much more than a fancy telescope and some bright lights to answer the origins of life inquiries. At Harvard, the Origins team also includes a geneticist, a chemist, a geochemist, an environmental chemist, and a palaeontologist - and that's just the steering committee.
The simple fact that scientists from all these different disciplines are sharing their progress is also massive reports in science, lengthy popular for its silos. "Most universities are configured alongside the lines set down by Victorians - chemistry, math, physics and so on," says molecular biologist John Sutherland of the Health-related Research Council in Cambridge.
The only way to approach these big concerns, states Prof Sutherland, is for researchers from distinct disciplines to work with each other, discover from each other, and propose answers that would never arise to individuals immersed in a solitary discipline.
At Harvard, workforce members share an casual lunch or dinner together once a month, and work meetings each week or two ( via bbc.co.uk ).