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Space Exploration (Science Fiction & Fantasy › Science Fiction, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for Space Exploration (Science Fiction & Fantasy › Science Fiction, Kindle eBooks), updated Nov 2, 2026: median price $4.99, median 1,524 reviews, average rating 4.5 and a KDPTop opportunity score of 28/100 (highly competitive).
| Price range (middle 50%) | $3.49 – $8.99 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 43% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- Its median reviews are 13% of the parent category Science Fiction (11,570), one of the easier corners under it.
- 43% of its best sellers came out in the last 90 days, more than in 98% of Kindle eBooks categories: readers here keep buying new titles.
- Its review barrier is higher than in 91% of Kindle eBooks categories: the median best seller has 1,524 reviews, so new books need time to build up.
Top 10 Space Exploration best sellers
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Engineer of the Exotic (The Saucer Series Book 1)
- List rank#5
- Price$2.99
- Rating4.4
- Reviews802
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Children of Time
- List rank#7
- Price$9.99
- Rating4.5
- Reviews51,769
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We Are Legion (We Are Bob) (Bobiverse Book 1)
by Dennis Taylor
- List rank#8
- Price$9.99
- Rating4.5
- Reviews35,050
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Dark Matter: Ellis McFadden Mysteries
by Kristen Painter
- List rank#9
- Price$5.99
- Rating4.7
- Reviews16
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House of Blades: A Space Opera Epic (Gates of Babylon Book 1)
by Joshua Dalzelle
- List rank#10
- Price$8.99
- Rating4.6
- Reviews127
Same niche in Books: Exploration
FAQ
Is Space Exploration a good niche for Amazon KDP?
Its KDPTop opportunity score is 28/100, which makes it highly competitive. The median best seller has 1,524 reviews and sells for $4.99.
How many reviews do you need to rank in Space Exploration?
The median best seller has 1,524 reviews, and 14% of them have fewer than 100.
What do Space Exploration best sellers cost?
The median price is $4.99; half of the best sellers are priced between $3.49 and $8.99.
Can new books break into Space Exploration?
43% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.