If you enjoy Science Fiction (In general, not just space-based Science Fiction), got a massive list here:
All of those are good, but I'd pick out Roadside Picnic, I, Robot, Ender's Game and War of the Worlds as some of my favourites, if you don't feel like crawling through the list.
Author/Editor | Title | Year
[S1] First book in a series; [C] Single-author collection; [A] Multiple author anthology
Orson Scott Card Ender's Game [S1] 1985
Frank Herbert Dune [S1] 1965
Isaac Asimov Foundation [S1-3]1951
Douglas Adams Hitch Hiker's Guide to the Galaxy [S1]1979
George Orwell 1984 1949
Robert A Heinlein Stranger in a Strange Land1961
Ray Bradbury Fahrenheit 451 1954
Arthur C Clarke 2001: A Space Odyssey1968
Isaac Asimov [C] I, Robot 1950
Robert A Heinlein Starship Troopers 1959
Philip K Dick Do Androids Dream of Electric Sheep?1968
William Gibson Neuromancer1984
Larry Niven Ringworld1970
Arthur C Clarke Rendezvous With Rama 1973
Dan Simmons Hyperion [S1] 1989
H G Wells The Time Machine 1895
Aldous Huxley Brave New World 1932
Arthur C ClarkeChildhood's End 1954
H G Wells The War of the Worlds 1898
Robert A Heinlein The Moon is a Harsh Mistress 1966
Joe Haldeman The Forever War 1974
Ray Bradbury [C] The Martian Chronicles 1950
Kurt Vonnegut Slaughterhouse Five 1969
Neal Stephenson Snow Crash1992
Niven & Pournelle The Mote in God's Eye 1975
Ursula K Le Guin The Left Hand of Darkness 1969
Orson Scott Card Speaker for the Dead [S2] 1986
Michael Crichton Jurassic Park 1990
Philip K Dick The Man in the High Castle 1962
Isaac Asimov The Caves of Steel 1954
Alfred Bester The Stars My Destination 1956
Frederik Pohl Gateway 1977
Roger Zelazny Lord of Light 1967
Stanislaw Lem Solaris 1961
Jules Verne 20,000 Leagues Under the Sea 1870
Madeleine L'Engle A Wrinkle In Time 1962
Kurt Vonnegut Cat's Cradle 1963
Michael Crichton The Andromeda Strain 1969
Carl Sagan Contact 1985
Isaac Asimov The Gods Themselves 1972
Vernor Vinge A Fire Upon the Deep 1991
Philip K Dick UBIK 1969
John Wyndham The Day of the Triffids 1951
Neal Stephenson Cryptonomicon 1999
Robert A Heinlein Time Enough For Love1973
Anthony Burgess A Clockwork Orange 1962
Kim Stanley Robinson Red Mars [S1] 1992
Walter M Miller A Canticle for Leibowitz 1959
Daniel Keyes Flowers for Algernon 1966
Mary Shelley Frankenstein 1818
Neal Stephenson The Diamond Age 1995
Isaac Asimov The End Of Eternity1955
Jules Verne Journey to the Center of the Earth1864
Ursula K Le Guin The Dispossessed 1974
Ron Hubbard Battlefield Earth 1982
Iain M Banks Player Of Games [S2]1988
Kurt Vonnegut The Sirens of Titan 1959
David Brin Startide Rising [S2]1983
Peter F Hamilton The Reality Dysfunction [S1] 1996
Orson Scott Card Ender's Shadow [S1] 1999
Greg Bear Eon 1985
Philip Jose Farmer To Your Scattered Bodies Go 1971
Philip K Dick A Scanner Darkly 1977
Niven & Pournelle Lucifer's Hammer 1977
Margaret Atwood The Handmaid's Tale 1985
Arthur C Clarke The City and the Stars 1956
Harry Harrison The Stainless Steel Rat [S1] 1961
Gene Wolfe The Shadow of the Torturer [S1] 1980
Alfred Bester The Demolished Man 1953
Michael Crichton Sphere 1987
Philip K Dick The Three Stigmata Of Palmer Eldritch 1964
Robert A Heinlein The Door Into Summer 1956
Alastair Reynolds Revelation Space [S1] 2000
Robert A Heinlein Citizen Of the Galaxy 1957
Connie Willis Doomsday Book 1992
Dan Simmons Ilium 2003
H G Wells The Invisible Man 1897
Robert A Heinlein Have Space-Suit - Will Travel 1958
C S Lewis Out of the Silent Planet [S1] 1938
Robert A Heinlein The Puppet Masters 1951
Edgar Rice Burroughs A Princess of Mars [S1] 1912
Ursula K Le Guin The Lathe of Heaven 1971
Clifford Simak Way Station 1963
John Wyndham The Chrysalids 1955
Iain M Banks Use of Weapons [S3] 1990
Edwin A Abbott Flatland 1884
Richard Morgan Altered Carbon [S1] 2002
John Scalzi Old Man's War 2005
David Brin The Postman 1985
Arkady & Boris Strugatsky Roadside Picnic 1972
Philip K Dick VALIS 1981
Julian May The Many-Colored Land [S1] 1981
John Brunner Stand on Zanzibar 1969
James Blish [C] Cities in Flight 1955
Stanislaw Lem [C] The Cyberiad 1974
Clifford Simak [C] City 1952
E E 'Doc' Smith Grey Lensman [S4] 1951
David Brin The Uplift War [S3] 1987
Arthur Conan Doyle The Lost World 1912
Cormac McCarthy The Road 2006
[S1] First book in a series; [C] Single-author collection; [A] Multiple author anthology
Orson Scott Card Ender's Game [S1] 1985
Frank Herbert Dune [S1] 1965
Isaac Asimov Foundation [S1-3]1951
Douglas Adams Hitch Hiker's Guide to the Galaxy [S1]1979
George Orwell 1984 1949
Robert A Heinlein Stranger in a Strange Land1961
Ray Bradbury Fahrenheit 451 1954
Arthur C Clarke 2001: A Space Odyssey1968
Isaac Asimov [C] I, Robot 1950
Robert A Heinlein Starship Troopers 1959
Philip K Dick Do Androids Dream of Electric Sheep?1968
William Gibson Neuromancer1984
Larry Niven Ringworld1970
Arthur C Clarke Rendezvous With Rama 1973
Dan Simmons Hyperion [S1] 1989
H G Wells The Time Machine 1895
Aldous Huxley Brave New World 1932
Arthur C ClarkeChildhood's End 1954
H G Wells The War of the Worlds 1898
Robert A Heinlein The Moon is a Harsh Mistress 1966
Joe Haldeman The Forever War 1974
Ray Bradbury [C] The Martian Chronicles 1950
Kurt Vonnegut Slaughterhouse Five 1969
Neal Stephenson Snow Crash1992
Niven & Pournelle The Mote in God's Eye 1975
Ursula K Le Guin The Left Hand of Darkness 1969
Orson Scott Card Speaker for the Dead [S2] 1986
Michael Crichton Jurassic Park 1990
Philip K Dick The Man in the High Castle 1962
Isaac Asimov The Caves of Steel 1954
Alfred Bester The Stars My Destination 1956
Frederik Pohl Gateway 1977
Roger Zelazny Lord of Light 1967
Stanislaw Lem Solaris 1961
Jules Verne 20,000 Leagues Under the Sea 1870
Madeleine L'Engle A Wrinkle In Time 1962
Kurt Vonnegut Cat's Cradle 1963
Michael Crichton The Andromeda Strain 1969
Carl Sagan Contact 1985
Isaac Asimov The Gods Themselves 1972
Vernor Vinge A Fire Upon the Deep 1991
Philip K Dick UBIK 1969
John Wyndham The Day of the Triffids 1951
Neal Stephenson Cryptonomicon 1999
Robert A Heinlein Time Enough For Love1973
Anthony Burgess A Clockwork Orange 1962
Kim Stanley Robinson Red Mars [S1] 1992
Walter M Miller A Canticle for Leibowitz 1959
Daniel Keyes Flowers for Algernon 1966
Mary Shelley Frankenstein 1818
Neal Stephenson The Diamond Age 1995
Isaac Asimov The End Of Eternity1955
Jules Verne Journey to the Center of the Earth1864
Ursula K Le Guin The Dispossessed 1974
Ron Hubbard Battlefield Earth 1982
Iain M Banks Player Of Games [S2]1988
Kurt Vonnegut The Sirens of Titan 1959
David Brin Startide Rising [S2]1983
Peter F Hamilton The Reality Dysfunction [S1] 1996
Orson Scott Card Ender's Shadow [S1] 1999
Greg Bear Eon 1985
Philip Jose Farmer To Your Scattered Bodies Go 1971
Philip K Dick A Scanner Darkly 1977
Niven & Pournelle Lucifer's Hammer 1977
Margaret Atwood The Handmaid's Tale 1985
Arthur C Clarke The City and the Stars 1956
Harry Harrison The Stainless Steel Rat [S1] 1961
Gene Wolfe The Shadow of the Torturer [S1] 1980
Alfred Bester The Demolished Man 1953
Michael Crichton Sphere 1987
Philip K Dick The Three Stigmata Of Palmer Eldritch 1964
Robert A Heinlein The Door Into Summer 1956
Alastair Reynolds Revelation Space [S1] 2000
Robert A Heinlein Citizen Of the Galaxy 1957
Connie Willis Doomsday Book 1992
Dan Simmons Ilium 2003
H G Wells The Invisible Man 1897
Robert A Heinlein Have Space-Suit - Will Travel 1958
C S Lewis Out of the Silent Planet [S1] 1938
Robert A Heinlein The Puppet Masters 1951
Edgar Rice Burroughs A Princess of Mars [S1] 1912
Ursula K Le Guin The Lathe of Heaven 1971
Clifford Simak Way Station 1963
John Wyndham The Chrysalids 1955
Iain M Banks Use of Weapons [S3] 1990
Edwin A Abbott Flatland 1884
Richard Morgan Altered Carbon [S1] 2002
John Scalzi Old Man's War 2005
David Brin The Postman 1985
Arkady & Boris Strugatsky Roadside Picnic 1972
Philip K Dick VALIS 1981
Julian May The Many-Colored Land [S1] 1981
John Brunner Stand on Zanzibar 1969
James Blish [C] Cities in Flight 1955
Stanislaw Lem [C] The Cyberiad 1974
Clifford Simak [C] City 1952
E E 'Doc' Smith Grey Lensman [S4] 1951
David Brin The Uplift War [S3] 1987
Arthur Conan Doyle The Lost World 1912
Cormac McCarthy The Road 2006
All of those are good, but I'd pick out Roadside Picnic, I, Robot, Ender's Game and War of the Worlds as some of my favourites, if you don't feel like crawling through the list.