Surprisingly, through observations made on the New Horizons mission, outer space is not black and might be brighter than we think. (Lauer 2021, "New Horizons Observations of the Cosmic Optical Background", The Astrophysics Journal)

Researchers went through images taken by the spacecraft's simple telescope and camera and looked for ones that were incredibly boring, the so-called "blank space" images, and subtracted all known source of light, including lights from stars, scatter light from the Milky way, and even light from hypothesized galaxies, and they are still left with plenty of unexplained light almost equivalent to the number of known lights.
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