A Giant Telescope Just Caught a Whispering Signal From Across the Universe!

Scientists have picked up a super-faint radio signal made of hydrogen [the oldest and most common gas in space] that traveled billions of light-years to reach us. By listening to this giant cosmic glow, we can now start building a massive 3D map of the entire universe! Just imagine what secret, star-filled galaxies we might find hiding on the map next.