Showers of particles that erupt when cosmic rays collide with Earth's atmosphere may have just given us a viable underground navigation system.
Cosmic ray muons raining down on, and partially through, the planet's surface have allowed scientists to calculate an individual's position in a building's basement, a location in which satellite global positioning systems don't work.
"Cosmic ray muons fall equally across the Earth and always travel at the same speed regardless of what matter they traverse, penetrating even kilometers of rock,""Now, by using muons, we have developed a new kind of GPS, which we have called the muometric positioning system , which works underground, indoors, and underwater."GPS works thanks to a technique called. GPS satellites orbit Earth, broadcasting signals on carrier radio waves.
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