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Hard SF

Rigorous scientific speculation.

521 titles

Often paired with

Social SF 129 Space Opera 121 Adventure 68 First Contact 35 Horror 32 Post-Apocalyptic 22

Peaks in

1950s 1940s 1960s 1930s 1890s

Explored most by

Jules Verne George O. Smith H. G. Wells Luis Senarens Murray Leinster E. E. Smith Mary Wollstonecraft Shelley Ray Cummings

See it mapped

On the Star Map →

Cover of Hex by Laurence M. Janifer

Laurence M. Janifer · 1959

Hard SFSocial SF

Holes, Incorporated

Cover of Holes, Incorporated by L. Major Reynolds

Holes, Incorporated

L. Major Reynolds · 1952

First ContactHard SF

Home is the Spaceman

Cover of Home is the Spaceman by George O. Smith

Home is the Spaceman

George O. Smith · 1953

Hard SFSpace Opera

Cover of Hot Planet by Hal Clement

Hal Clement · 1963

ColonizationHard SF

Houlihan's Equation

Cover of Houlihan's Equation by Walter J. Sheldon

Houlihan's Equation

Walter J. Sheldon · 1960

Hard SFSpace Opera

Cover of Hystereo by Maurice Baudin

Maurice Baudin · 1961

Cover of Ice Planet by Carl Selwyn

Carl Selwyn · 1941

Hard SFSpace Opera

If at First You Don't...

Cover of If at First You Don't... by John Brudy

If at First You Don't...

John Brudy · 1960

Hard SFSpace Opera

Ilmasota: Tulevaisuuden kuvaus

Cover of Ilmasota: Tulevaisuuden kuvaus by H. G. Wells

Ilmasota: Tulevaisuuden kuvaus

H. G. Wells · 1908

Hard SFMilitary SF

Ilmojen valloittaja

Cover of Ilmojen valloittaja by Jules Verne

Ilmojen valloittaja

Jules Verne · 1886

4 hr 17 min read

AdventureHard SF

In the Control Tower

Cover of In the Control Tower by Will Mohler

In the Control Tower

Will Mohler · 1963

Hard SFSpace Opera

In the Earth's Shadow

Cover of In the Earth's Shadow by John L. Chapman

In the Earth's Shadow

John L. Chapman · 1940

Hard SFSpace Opera

In the year 2889

Cover of In the year 2889 by Michel Verne Jules Verne

In the year 2889

Michel Verne Jules Verne · 1889

Hard SFSocial SF

Cover of Instinct by George O. Smith

George O. Smith · 1952

Hard SFSocial SF

Cover of Into the Sun by John L. Chapman

John L. Chapman · 1941

Hard SFSpace Opera

Into the fourth dimension

Cover of Into the fourth dimension by Ray Cummings

Into the fourth dimension

Ray Cummings · 1941

2 hr 27 min read

AdventureHard SF

Islands of Space

Cover of Islands of Space by Jr. John W. Campbell

Islands of Space

Jr. John W. Campbell · 1931

4 hr 16 min read

Hard SFSpace Opera

Jinx Ship to the Rescue

Cover of Jinx Ship to the Rescue by Alfred Coppel

Jinx Ship to the Rescue

Alfred Coppel · 1948

Hard SFSpace Opera

John Jones's Dollar

Cover of John Jones's Dollar by Harry Stephen Keeler

John Jones's Dollar

Harry Stephen Keeler · 1915

Hard SFSocial SF

John's Other Practice

Cover of John's Other Practice by Winston K. Marks

John's Other Practice

Winston K. Marks · 1954

Hard SFSocial SF

Cover of Jordens Inre by Otto Witt

Otto Witt · 1912

1 hr 32 min read

Hard SFLost World

Journey for the Brave

Cover of Journey for the Brave by Alan Edward Nourse

Journey for the Brave

Alan Edward Nourse · 1954

Hard SFSpace Opera

Junior Achievement

Cover of Junior Achievement by William M. Lee

Junior Achievement

William M. Lee · 1955

Hard SFSocial SF

Cover of Jupiter's Joke by A. L. Haley

A. L. Haley · 1954

Hard SFSpace Opera

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