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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

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Restricted Tool

Cover of Restricted Tool by Malcolm B. Morehart

Restricted Tool

Malcolm B. Morehart · 1953

First ContactHard SF

Cover of Resurrection by Robert Shea

Robert Shea · 1959

Hard SFSocial SF

Cover of Revenge by Arthur Porges

Arthur Porges · 1959

Hard SFSocial SF

Ribbon in the sky

Cover of Ribbon in the sky by Murray Leinster

Ribbon in the sky

Murray Leinster · 1957

Hard SFSpace Opera

Robur de Veroveraar

Cover of Robur de Veroveraar by Jules Verne

Robur de Veroveraar

Jules Verne · 1886

AdventureHard SF

Robur der Sieger

Cover of Robur der Sieger by Jules Verne

Robur der Sieger

Jules Verne · 1886

4 hr 38 min read

AdventureHard SF

Robur the Conqueror

Cover of Robur the Conqueror by Jules Verne

Robur the Conqueror

Jules Verne · 1886

3 hr 28 min read

AdventureHard SF

Robur, o Conquistador

Cover of Robur, o Conquistador by Jules Verne

Robur, o Conquistador

Jules Verne · 1886

4 hr 12 min read

AdventureHard SF

Robur-le-conquérant

Cover of Robur-le-conquérant by Jules Verne

Robur-le-conquérant

Jules Verne · 1886

4 hr 18 min read

AdventureHard SF

Cover of Rocket Summer by Ray Bradbury

Ray Bradbury · 1947

Hard SFSocial SF

Saboteur of Space

Cover of Saboteur of Space by Robert Abernathy

Saboteur of Space

Robert Abernathy · 1944

Hard SFSpace Opera

Salvage in Space

Cover of Salvage in Space by Jack Williamson

Salvage in Space

Jack Williamson · 1933

Hard SFSpace Opera

Sam, This Is You

Cover of Sam, This Is You by Murray Leinster

Sam, This Is You

Murray Leinster · 1955

Hard SFSocial SF

Cover of Sand Doom by Murray Leinster

Murray Leinster · 1955

1 hr 7 min read

ColonizationHard SF

Sans dessus dessous

Cover of Sans dessus dessous by Jules Verne

Sans dessus dessous

Jules Verne · 1889

3 hr 13 min read

AdventureHard SF

Satellite Passage

Cover of Satellite Passage by Theodore L. Thomas

Satellite Passage

Theodore L. Thomas · 1958

Hard SFMilitary SF

Satellite System

Cover of Satellite System by H. B. Fyfe

Satellite System

H. B. Fyfe · 1960

Hard SFSpace Opera

Say "Hello" for Me

Cover of Say "Hello" for Me by Frank W. Coggins

Say "Hello" for Me

Frank W. Coggins · 1960

First ContactHard SF

Scientific Romances (First Series)

Cover of Scientific Romances (First Series) by Charles Howard Hinton

Scientific Romances (First Series)

Charles Howard Hinton · 1886

3 hr 52 min read

Hard SFSocial SF

Cover of Scrimshaw by Murray Leinster

Murray Leinster · 1955

Hard SFSpace Opera

Second Childhood

Cover of Second Childhood by Clifford D. Simak

Second Childhood

Clifford D. Simak · 1951

Hard SFSocial SF

Secret of the Painting

Cover of Secret of the Painting by Robert Moore Williams

Secret of the Painting

Robert Moore Williams · 1957

Hard SFSocial SF

Seed of the Arctic Ice

Cover of Seed of the Arctic Ice by Harry Bates

Seed of the Arctic Ice

Harry Bates · 1932

AdventureHard SF

Shipwreck in the Sky

Cover of Shipwreck in the Sky by Eando Binder

Shipwreck in the Sky

Eando Binder · 1957

Hard SFSpace Opera

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