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Find the most profitable Kindle niche categories

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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
Books > Fiction > Science Fiction > Space Opera 83 3,477 £2,172 £3.88 87% 18% 31% 50% ~ 30,000
Books > Fiction > Science Fiction > Space Exploration 112 5,154 £1,086 £3.88 95% 20% 20% 50% ~ 7,000
Books > Fiction > Science Fiction > Military > Space Fleet 378 6,043 £1,508 £4.49 85% 25% 50% 77% ~ 7,000
Books > Fiction > Science Fiction > Military > Space Marine 351 10,559 £1,081 £4.29 100% 20% 55% 77% ~ 6,000
Books > Arts & Photography > Music > Scores, Songbooks & Lyrics > Opera & Classical 451 38,258 £913 £10.88 100% 0% 15% 0% ~ 40,000
Books > Children's Books > Science, Nature & How It Works > Aeronautics & Space 557 50,642 £2,091 £7.47 95% 0% 0% 0% ~ 4,000
Books > Biography > Theatre & Performance Art > Opera 8,024 115,734 £312 £11.17 95% 0% 0% 0% ~ 40,000
Books > Young Adult > Science Fiction & Fantasy > Science Fiction > Space Opera 4,813 204,705 £157 £5.62 100% 10% 30% 36% ~ 483
Books > Young Adult > Science & Technology > Technology > Air & Space Science 23,250 451,796 £283 £10.13 100% 5% 15% 3% ~ 316
Books > Arts & Photography > Music > Styles > Opera 16,529 1,461,781 £279 £9.99 100% 5% 0% 3% ~ 6,000
Books > Science & Nature > Astronomy & Cosmology > Space Travel & Exploration 96,280 1,646,438 £0 £8.99 90% 10% 50% 0% ~ 671