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cosmic optical background
How dark is a place? Global glue displays There are fewer galaxies than we thought, scientists say
/https://specials-images.forbesimg.com/imageserve/5ffdf2350111daa93089a401/0x0.jpg?fit=300%2C300&ssl=1 "How dark is a place? Global glue displays There are fewer galaxies than we thought, scientists say")