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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 →

Egocentric Orbit

Cover of Egocentric Orbit by John Cory

Egocentric Orbit

John Cory · 1962

Einstein's planetoid

Cover of Einstein's planetoid by C. M. Kornbluth

Einstein's planetoid

C. M. Kornbluth & Frederik Pohl & Robert W. Lowndes · 1942

Hard SFSpace Opera

Electro-episoded in A.D. 2025

Cover of Electro-episoded in A.D. 2025 by E. D. Skinner

Electro-episoded in A.D. 2025

E. D. Skinner · 1927

Expedition to Pluto

Cover of Expedition to Pluto by Fletcher Pratt Laurence Manning

Expedition to Pluto

Fletcher Pratt Laurence Manning · 1939

1 hr 17 min read

Hard SFSpace Opera

Face au drapeau

Cover of Face au drapeau by Jules Verne

Face au drapeau

Jules Verne · 1896

4 hr 19 min read

AdventureHard SF

Facing the Flag

Cover of Facing the Flag by Jules Verne

Facing the Flag

Jules Verne · 1896

3 hr 50 min read

AdventureHard SF

Far enough to touch

Cover of Far enough to touch by Stephen Bartholomew

Far enough to touch

Stephen Bartholomew · 1962

Hard SFSpace Opera

Cover of Fine Feathers by George O. Smith

George O. Smith · 1946

First ContactHard SF

First Stage: Moon

Cover of First Stage: Moon by Dick Hetschel

First Stage: Moon

Dick Hetschel · 1954

Hard SFSpace Opera

First on the Moon

Cover of First on the Moon by Jeff Sutton

First on the Moon

Jeff Sutton · 1958

3 hr 57 min read

Hard SFSpace Opera

Cover of Flamedown by H. B. Fyfe

H. B. Fyfe · 1961

Hard SFSpace Opera

Flatland: A Romance of Many Dimensions

Cover of Flatland: A Romance of Many Dimensions by Edwin Abbott Abbott

Flatland: A Romance of Many Dimensions

Edwin Abbott Abbott · 1884

1 hr 51 min read

Hard SFSocial SF

Flatland: A Romance of Many Dimensions

Cover of Flatland: A Romance of Many Dimensions by Edwin Abbott Abbott

Flatland: A Romance of Many Dimensions

Edwin Abbott Abbott · 1884

2 hr 7 min read

Hard SFSocial SF

Flatland: A Romance of Many Dimensions

Cover of Flatland: A Romance of Many Dimensions by Edwin Abbott Abbott

Flatland: A Romance of Many Dimensions

Edwin Abbott Abbott · 1884

1 hr 59 min read

Hard SFSocial SF

Flyvefisken »Prometheus« (En Fremtidsfantasi)

Cover of Flyvefisken »Prometheus« (En Fremtidsfantasi) by Vilhelm Bergsøe

Flyvefisken »Prometheus« (En Fremtidsfantasi)

Vilhelm Bergsøe · 1869

AdventureHard SF

Forbidden flight

Cover of Forbidden flight by Chester Cohen

Forbidden flight

Chester Cohen · 1941

Hard SFSpace Opera

Formula for murder

Cover of Formula for murder by Milton A. Rothman

Formula for murder

Milton A. Rothman · 1957

Hard SFSocial SF

Frank Reade Jr. and His Engine of the Clouds

Cover of Frank Reade Jr. and His Engine of the Clouds by Luis Senarens

Frank Reade Jr. and His Engine of the Clouds

Luis Senarens · 1903

2 hr 57 min read

AdventureHard SF

Frank Reade Jr.'s Air Wonder, The "Kite"; Or, A Six Weeks' Flight Over the Andes

Cover of Frank Reade Jr.'s Air Wonder, The "Kite"; Or, A Six Weeks' Flight Over the Andes by Luis Senarens

Frank Reade Jr.'s Air Wonder, The "Kite"; Or, A Six Weeks' Flight Over the Andes

Luis Senarens · 1902

2 hr 34 min read

AdventureHard SF

Frank Reade Jr.'s Submarine Boat; or, to the North Pole Under the Ice.

Cover of Frank Reade Jr.'s Submarine Boat; or, to the North Pole Under the Ice. by Luis Senarens

Frank Reade Jr.'s Submarine Boat; or, to the North Pole Under the Ice.

Luis Senarens · 1902

2 hr 49 min read

AdventureHard SF

Frank Reade and His Steam Horse

Cover of Frank Reade and His Steam Horse by Luis Senarens

Frank Reade and His Steam Horse

Luis Senarens · 1892

AdventureHard SF

Frank Reade, Jr.'s Search for the Silver Whale

Cover of Frank Reade, Jr.'s Search for the Silver Whale by Luis Senarens

Frank Reade, Jr.'s Search for the Silver Whale

Luis Senarens · 1903

2 hr 50 min read

AdventureHard SF

Frank Reade, Jr., Fighting the Terror of the Coast

Cover of Frank Reade, Jr., Fighting the Terror of the Coast by Luis Senarens

Frank Reade, Jr., Fighting the Terror of the Coast

Luis Senarens · 1903

2 hr 39 min read

AdventureHard SF

Frank Reade, Jr., With His New Steam Man in Central America

Cover of Frank Reade, Jr., With His New Steam Man in Central America by Luis Senarens

Frank Reade, Jr., With His New Steam Man in Central America

Luis Senarens · 1902

2 hr 19 min read

AdventureHard SF

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