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Balanced rating combines the average and the number of ratings; small samples carry less weight. How ranking works ↗

Genetic engineering2015

Unchanged

Jessica Brody

4.0(1)Open Library rating out of 5

Book1994

Uncharted Territory

Connie Willis

4.0(1)Open Library rating out of 5

Book2018

Uncompromising honor

David Weber; Allyson Johnson

4.0(1)Open Library rating out of 5

Space opera2020

Unconquerable Sun

Kate Elliott

4.0(1)Open Library rating out of 5

Book2009

Undaunted

Mike Shepherd

4.0(1)Open Library rating out of 5

Book1975

Under a calculating star

John Morressy; Paul Alexander; John Morressy

4.0(1)Open Library rating out of 5

Book2001

Under Glass

Nalo Hopkinson

4.0(1)Open Library rating out of 5

Time travel1998

Under Loch and Key (Goners)

Jamie Simons; E. W. Scollon

4.0(1)Open Library rating out of 5

Book2022

Under Pressure

Cory McCarthy

4.0(1)Open Library rating out of 5

Book1993

Under South American Skies (Future Earths)

Mike Resnick; Gardner R. Dozois; Orson Scott Card

4.0(1)Open Library rating out of 5

Apocalypse & aftermath2016

Under the Eye of the Big Bird

川上弘美

4.0(1)Open Library rating out of 5

Life on Mars2012

Under the moons of Mars

new adventures on Barsoom

John Joseph Adams

4.0(1)Open Library rating out of 5

Book1997

Under the Western Acacia

Christian Jacq

4.0(1)Open Library rating out of 5

Book1987

UNDER THE WHEEL (Alien Stars; V. 3)

Gregory Benford

4.0(1)Open Library rating out of 5

Book1990

Under the Yoke

S. M. Stirling

4.0(1)Open Library rating out of 5

Robots & androids2016

Under their skin

Margaret Peterson Haddix

4.0(1)Open Library rating out of 5

Book2003

Under water

J. C. Greenburg

4.0(1)Open Library rating out of 5

Space opera2014

Undercity

Catherine Asaro

4.0(1)Open Library rating out of 5

Book1982

Undersea

Paul Hazel

4.0(1)Open Library rating out of 5

Undertaker's Gift

Trevor Baxendale

4.0(1)Open Library rating out of 5

Unearthed

Amie Kaufman; Meagan Spooner

4.0(1)Open Library rating out of 5

Unearthly Disclosure

Conflicting Interests in the Control of Extraterrestrial Intelligence

Timothy Good

4.0(1)Open Library rating out of 5

Book1960

Unearthly neighbors

Chad Oliver

4.0(1)Open Library rating out of 5

Book2010

Unexpected Rain

Jason LaPier

4.0(1)Open Library rating out of 5