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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

The Earth is studded with telescopes, listening for electromagnetic radiation from the

great beyond. In a decade ago, astronomers stumbled upon a mysterious signal, a powerful pulse

of radio waves just a few thousandths of a second long. Mysterious because...

What is the nature of the sources?

Avi Loeb, a theoretical astrophysicist at Harvard.

Whatever the sources are, he says.

They seem to be brighter by tens of billions of times more than the brightest radio sources we know about.

The radio pulses are known as fast radio bursts,

and Loeb says you'd need something tens of billions of times brighter than a pulsar to produce

them.

So he and his colleague, Monosvi-Lingham, investigated another possibility.

We know of one simple way to generate very powerful radio waves, and that's using radio antenna.

A radio antenna built and controlled by extraterrestrials, to be more precise.

Lobenlingham did the math on how big that stellar-powered radio antenna would have to be

to transmit signals like fast radio bursts, and whether it would even hold up from an engineering

standpoint, like would it melt

...