the.com/radio waves
the universe's longest wavelengths, carrying everything from pop songs to proof the big bang happened.
means electromagnetic radiation with wavelengths longer than infrared, used to carry information through air, space, and walls without wires.
from predicted by maxwell's equations in 1865, proven real by hertz in 1887 who then shrugged that they had no practical use whatsoever.
hertz's mistakehe thought radio waves were scientifically interesting but useless
speedtravel at light speed, no exceptions
cosmic leftovercosmic microwave background is radio static from the big bang
wavelength rangecan stretch longer than a football field