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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
Kindle eBooks > Science Fiction & Fantasy > Science Fiction > Space Opera 275 4,136 $10,479 $4.99 85% 55% 55% 77% ~ 20,000
Kindle eBooks > Science Fiction & Fantasy > Science Fiction > Military > Space Fleet 394 4,397 $11,037 $4.99 95% 55% 50% 97% ~ 768
Kindle eBooks > Science Fiction & Fantasy > Science Fiction > Military > Space Marine 236 6,361 $8,802 $4.99 100% 75% 50% 100% ~ 5,000
Kindle eBooks > Science Fiction & Fantasy > Science Fiction > Space Exploration 228 9,820 $5,588 $4.99 95% 40% 20% 70% ~ 6,000
Kindle eBooks > Science & Math > Astronomy & Space Science 828 71,164 $1,664 $8.49 100% 0% 25% 23% N/A
Kindle eBooks > Science & Math > Astronomy & Space Science > Astrophysics & Space Science 3,405 98,156 $181 $6.49 90% 0% 20% 23% ~ 4,000
Kindle eBooks > Science & Math > Astronomy & Space Science > Cosmology 700 115,495 $755 $8.99 95% 5% 25% 27% ~ 2,000
Kindle eBooks > Teen & Young Adult > Science Fiction & Fantasy > Science Fiction > Space Opera 9,950 152,808 $223 $3.99 95% 15% 35% 63% ~ 183
Kindle eBooks > Science & Math > Astronomy & Space Science > Astronomy 2,204 164,565 $324 $5.8 100% 0% 30% 37% ~ 3,000
Kindle eBooks > Science & Math > Astronomy & Space Science > Aeronautics & Astronautics 11,608 191,672 $153 $5.49 90% 5% 30% 33% ~ 3,000
Kindle eBooks > History > Science & Medicine > Astronomy 9,257 192,681 $279 $9.99 100% 5% 0% 30% ~ 1,000
Kindle eBooks > Nonfiction > Children's Nonfiction > Science, Nature & How It Works > Astronomy 4,887 201,993 $335 $5.99 65% 0% 20% 33% ~ 868