As we as that the universe is expanding and so
does the space, the wavelengths are stretching, becoming longer and longer, and
the light emoting from space objects is changing. Over a few million years, the
orange spectrum of light that the cosmos once released changed from red to
infrared, which is not observable by the human eye, so to us just looks dark.
And space wasn't always black. Learn more about this in the video below:
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