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Category name Best seller rank 50th book's rank Median sales($) Median price ($) Volatility (%) New releases (%) Self pub.(%) KDP Select (%) Competition
Kindle eBooks > Science Fiction & Fantasy > Science Fiction > Space Opera 152 4,779 £2,346 £3.99 95% 25% 35% 67% ~ 20,000
Kindle eBooks > Science Fiction & Fantasy > Science Fiction > Military > Space Fleet 914 5,456 £1,816 £4.99 90% 45% 45% 87% ~ 6,000
Kindle eBooks > Science Fiction & Fantasy > Science Fiction > Space Exploration 150 5,704 £1,198 £3.89 90% 40% 15% 67% ~ 5,000
Kindle eBooks > Science Fiction & Fantasy > Science Fiction > Military > Space Marine 351 6,130 £1,005 £3.99 95% 30% 60% 87% ~ 5,000
Kindle eBooks > Children's eBooks > Animals > Fish & Marine Life > Marine Life 15,614 138,524 £88 £3.16 95% 0% 5% 30% ~ 2,000
Kindle eBooks > Children's eBooks > Science, Nature & How It Works > Astronomy & Space > Aeronautics & Space 17,269 215,682 £109 £3.92 75% 5% 5% 27% ~ 588
Kindle eBooks > Children's eBooks > Science, Nature & How It Works > Astronomy & Space > Astronomy 17,269 218,326 £111 £3.99 95% 0% 15% 37% ~ 939
Kindle eBooks > Children's eBooks > Animals > Fish & Marine Life > Fish 12,663 381,091 £124 £4.43 95% 0% 10% 43% ~ 1,000
Kindle eBooks > Science & Math > Biological Sciences > Biology > Marine Biology 1,568 510,521 £167 £5.99 95% 0% 15% 33% ~ 1,000
Kindle eBooks > Children's eBooks > Science, Nature & How It Works > Astronomy & Space 24,046 1,208,976 £111 £3.99 100% 0% 10% 37% ~ 1,000
Kindle eBooks > Children's eBooks > Animals > Fish & Marine Life 11,958 1,845,828 £104 £3.74 90% 5% 15% 40% ~ 3,000