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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 > Children's Books > History > Exploration & Discovery 553 8,527 £2,251 £6.7 90% 0% 0% 0% ~ 2,000
Books > Fiction > Science Fiction > Military > Space Marine 351 10,559 £1,081 £4.29 100% 20% 55% 77% ~ 6,000
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 > Science & Nature > Earth Sciences & Geography > Geography > Discovery & Exploration 1,736 59,788 £504 £9 95% 10% 0% 5% ~ 8,000
Books > Young Adult > Science Fiction & Fantasy > Science Fiction > Space Opera 4,813 204,705 £157 £5.62 100% 10% 30% 36% ~ 483
Books > Children's Books > Literature & Fiction > Historical > Exploration & Discoveries 3,646 205,118 £205 £7.35 100% 5% 5% 7% ~ 625
Books > Young Adult > History > Exploration & Discovery 6,596 373,164 £205 £7.35 95% 0% 5% 3% ~ 370
Books > Young Adult > Science & Technology > Technology > Air & Space Science 23,250 451,796 £283 £10.13 100% 5% 15% 3% ~ 316
Books > Young Adult > Historical Fiction > Exploration & Discoveries 4,048 701,439 £139 £4.99 80% 0% 10% 38% ~ 156