For example, remote-control devices work by sending infrared signals at about 940 nanometers to your television or stereo. But we use infrared in more down-to-Earth ways as well.
A sensitive detector like the James Webb Space Telescope can discern this thermal energy from far across the universe. We can’t see infrared waves, but we can feel them as heat. GLASS-z13 appears as a red dot in this NIRCam color composite. On either side of the visible band lies evidence of interstellar gas clouds, the hottest stars in the universe, gas clouds between galaxies, the gas that rushes into black holes, and much more. The universe may be lovely to look at in this band, but our vision skips right over vast ranges of wavelengths that are either shorter or longer than this limited range. This is what we call the visible part of the electromagnetic spectrum. Humans can perceive just a tiny sliver of the electromagnetic spectrum: wavelengths from about 380 to 750 nanometers.
Too bad we can glimpse only about 0.0035 percent of the light in the universe with our naked eyes. Let’s nerd out over it together-join Pop Mech Pro. They always travel through the vacuum of space at 186,400 miles per second-the speed of light-which is faster than anything else. Photons, which are tiny parcels of energy, have been traveling across the universe since they first exploded from the Big Bang. But the path it takes from Point A to Point B is always a waveform, with higher-energy light traveling in shorter wavelengths. Light travels only one way: in a straight line. Check out how our telescopes detect different wavelengths of light from space.
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