Manifold, de l’anglais Stephen Baxter, est une série de trois romans suivis d’un recueil de nouvelles dans le même thème.
Chacun de ces livres traite du paradoxe de Fermi (aucun contact avec des aliens jusqu’à présent malgré la forte probabilité que la Terre ne soit pas la seule planète à abriter la vie dans l’univers), avec à chaque fois une explication possible de ce paradoxe.
Le personnage principal est présent dans tous les volumes, mais les histoires se déroulent toutes dans des univers différents.

Stephen Baxter  - Manifold: Time
Stephen Baxter  (1999)
The year is 2010. More than a century of ecological damage, industrial and technological expansion, and unchecked population growth has left the Earth on the brink of devastation. As the world's governments turn inward, one man dares to envision a bolder, brighter future. That man, Reid Malenfant, has a very different solution to the problems plaguing the planet: the exploration and colonization of space. Now Malenfant gambles the very existence of time on a single desperate throw of the dice. Battling national sabotage and international outcry, as apocalyptic riots sweep the globe, he builds a spacecraft and launches it into deep space. The odds are a trillion to one against him. Or are they?
Stephen Baxter  - Manifold: Space
Stephen Baxter  (2000)
The year is 2020. Fueled by an insatiable curiosity, Reid Malenfant ventures to the far edge of the solar system, where he discovers a strange artifact left behind by an alien civilization: A gateway that functions as a kind of quantum transporter, allowing virtually instantaneous travel over the vast distances of interstellar space. What lies on the other side of the gateway? Malenfant decides to find out. Yet he will soon be faced with an impossible choice that will push him beyond terror, beyond sanity, beyond humanity itself. Meanwhile on Earth the Japanese scientist Nemoto fears her worst nightmares are coming true. Startling discoveries reveal that the Moon, Venus, even Mars once thrived with life?life that was snuffed out not just once but many times, in cycles of birth and destruction. And the next chilling cycle is set to begin again...
Stephen Baxter  - Manifold: Origin
Stephen Baxter  (2001)
In the year 2015, astronaut Reid Malenfant is flying over the African continent, intent on examining a mysterious glowing construct in Earth's orbit. But when the very fabric of the sky tears open, spilling living creatures to the ground and pulling others inside (including his wife, Emma), Malenfant's quest to uncover the unknown becomes personal. While desperately searching to discover what happened to the woman he loves, Malenfant embarks upon an adventure to the very fount of human development... on earth and beyond.
Stephen Baxter  - Phase Space
Stephen Baxter  (2003)
In these twenty-three thematically linked stories Stehpen Baxter explores our relationship with the universe. Are we truly alone? If there are other intelligent species, have they turned their back on the stars, or is expansion itself destined to fail? Perhaps the univers we know is an elaborate illusion that protects us from a more fearful reality. These ideas and many paradoxes between come alive in the hands of the most acclaimed and brilliant science fiction writer of the present day.