Fast Radio Bursts Mystify Experts — for Now

What shines brighter than the Sun, appears for only a split second and lights up Earth’s skies thousands of times each day?

If you’re stumped, don’t worry—experts are too. For nearly a decade, astrophysicists have been struggling to explain perplexing millisecond chirps of radio waves pinging through the heavens. Now, several new studies are bringing researchers closer to solving the mystery by narrowing the search for the radio flashes’ origins to youthful stellar outbursts in distant galaxies.

more…

Aliens?

Depends how tightly they are limited to a specific frequency.