Royalty-Free Science Photos, minimum size: 4k, dominant color: gray, sorted by aesthetic score
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3872x2592
Public Domain
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4928x3285
Public Domain
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4168x3126
Public Domain
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1124x1437
Public Domain
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6000x4000
Public Domain
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5676x3784
Public Domain
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4104x2736
Public Domain
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4125x2750
Public Domain
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4928x3280
Public Domain
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5184x3456
Public Domain
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5388x3592
Public Domain
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3337x5000
Public Domain
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5204x3469
Public Domain
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5184x3456
Public Domain
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3456x5184
Public Domain
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5652x3768
Public Domain
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3992x2242
Public Domain
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5472x3648
Public Domain