What Astronomers Just Discovered Between Galaxies Changes Everything

For decades, scientists have known that a massive chunk of the universe’s ordinary matter was missing. Not dark matter, the elusive substance that doesn’t interact with light, but regular, everyday matter made of atoms. 

And now, thanks to a brilliant use of cosmic radio signals, that mystery may finally be solved.

In a new study published in Nature Astronomy, astronomers used fast radio bursts (FRBs)—brief, millisecond-long blasts of energy from deep space—to detect where all that missing matter was hiding...