The first fast radio burst, or FRB, was discovered in 2007 ... acting like a celestial slide whistle. The dip became even more obvious when the researchers converted the signals into sounds ...

Astronomers watched 35 explosive outbursts from a rare repeating "fast radio burst" (FRB) as it shifted in frequency like a "cosmic slide whistle," blinking in a puzzling pattern never seen before.

Though you can always choose a premade template, you may want to customize your PowerPoint slide backgrounds manually. You can add a custom background to one or more slides, and you'll also have ...