A fleet of DIY solar-powered, high-altitude research balloons have recorded a mysterious low-frequency sound high in the upper atmosphere that repeats a number of times each hour. The sound occurs in the infrasound range, meaning it’s below the threshold of human hearing, only occasionally spiking as high as 25read more

  Astronomers may have solved the mystery behind the source of the enigmatic phenomenon called fast radio bursts, powerful blasts of radio waves from far outside the Milky Way Galaxy that last for mere fractions of a second, with a recently-discovered celestial body that is surprisingly close to our homeread more