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When you think of extraterrestrial life, what do you see?

Is it little green men asking to be taking to your leader?

Perhaps it's a small brown creature with big eyes, riding on the back of a child's bike.

The search for extraterrestrial intelligence, often called just seti,

has always had something of an image problem.

For decades it's been relegated to the fringes of astronomy,

something for those more interested in sci-fi than science.

Hello and welcome to Babbage on Economist Radio,

our weekly podcast about science and technology.

I'm Alok Chah, science correspondent for the Economist.

By the turn of the 21st century, people were starting to lose interest in seti,

and with decades of no results, money for the endeavour was dwindling.

But things are now changing.

A renaissance in astronomy and astrophysics in the past two decades has transformed how we see the universe around us.

Astronomers have discovered thousands of exoplanets that's planets outside our solar system.

They could be habitable for life like our own.

...