In copyright
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Credit
M0006086: Spiral Nebulae with open arms (M51), from Jeans: <i>Astronomy and Cosmogony</i> (1929) / M0006086EB: Spiral Nebulae with open arms (M101), from Jeans: <i>Astronomy and Cosmogony</i> (1929). In copyright. Source: Wellcome Collection.