Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe. Dark matter is called "dark" because it does not appear to interact with the electromagnetic field, which means it does not absorb, reflect, or emit electromagnetic radiation and is, therefore, difficult to detect. Various astrophysical observations – including gravitational effects which cannot be explained by currently accepted theories of gravity unless more matter is present than can be seen – imply dark matter's presence. For this reason, most experts think that dark matter is abundant in the universe and has had a strong influence on its structure and evolution.
A wormhole is a hypothetical structure connecting disparate points in spacetime, and is based on a special solution of the Einstein field equations.
Stephen Baxter is an English hard science fiction author. He has degrees in mathematics and engineering.
Vacuum Diagrams is a collection of science fiction short stories by British writer Stephen Baxter. The collection connects the novels of the Xeelee Sequence and also shows the history of mankind in the Xeelee universe, and ultimately the universe. While each short story in the collection is self-contained, the stories are presented as being contained in the context of the first story, "Eve", about a man who is forced to witness the events in the short stories by a god-like being. "Eve" acts as a structure for the short stories, with an introduction at the beginning of Vacuum Diagrams, short scenes occurring between each "era", and an ending that wraps up the plot for the "Eve" story itself. Vacuum Diagrams won the Philip K. Dick Award in 1999.
"Blue Shift" is the tenth story chronologically to appear in Stephen Baxter's collection of linked stories anthology novel Vacuum Diagrams. "Blue Shift" was originally published in Writers of the Future volume 5 in 1989.
The concept of self-replicating spacecraft, as envisioned by mathematician John von Neumann, has been described by futurists including physicist Michio Kaku and discussed across a wide breadth of hard science fiction novels and stories. Self-replicating probes are sometimes referred to as von Neumann probes. Self-replicating spacecraft would in some ways either mimic or echo the features of living organisms or viruses.
A Stargate is a fictional Einstein–Rosen bridge portal device within the Stargate fictional universe that allows practical, rapid travel between two distant locations. The devices first appeared in the 1994 Roland Emmerich film Stargate, and thereafter in the television series Stargate SG-1, Stargate Atlantis, and Stargate Universe. In these productions, the Stargate functions as a plot device, allowing the main characters to visit alien planets without the need for spaceships or any other type of technology. The device allows for near-instantaneous travel across both interstellar and extragalactic distances.
Krona is a supervillain appearing in comic books published by DC Comics.
Raft is a 1991 hard science fiction book by British writer Stephen Baxter. Raft is both Baxter's debut novel and the first book in the Xeelee Sequence, although the Xeelee are not present. Raft was nominated for the Arthur C. Clarke Award in 1992.
Timelike Infinity is a 1992 science fiction book by British author Stephen Baxter. The second book in the Xeelee Sequence, Timelike Infinity introduces a universe of powerful alien species and technologies that manages to maintain a realistic edge because of Baxter's physics background. It largely sets the stage for the magnum opus of the Xeelee Sequence, Ring.
Exultant is a science fiction novel by British author Stephen Baxter. It is part two of the Destiny's Children series. The book was published by Victor Gollancz Ltd in September 2004.
Flux is a 1993 science fiction novel by British author Stephen Baxter. It is the third book in Baxter's Xeelee Sequence.
Resplendent is an English language science fiction collection by British writer Stephen Baxter, published in 2006. It is the fourth and final book in the Destiny's Children series.
Destiny's Children is a science-fiction series by Stephen Baxter. It takes place within his larger series, the Xeelee Sequence. Like his previous Manifold Trilogy, the books are not direct sequels to one another, but are instead thematically linked by the appearance of concepts, themes, and sometimes characters in multiple books. Examples of this include:
The Xeelee Sequence is a series of hard science fiction novels, novellas, and short stories written by British science fiction author Stephen Baxter. The series spans billions of years of fictional history, centering on humanity's future expansion into the universe, its intergalactic war with an enigmatic and supremely powerful Kardashev Type IV alien civilization called the Xeelee, and the Xeelee's own cosmos-spanning war with dark matter entities called Photino Birds. The series features many other species and civilizations that play a prominent role, including the Squeem, the Qax, and the Silver Ghosts. Several stories in the Sequence also deal with humans and posthumans living in extreme conditions, such as at the heart of a neutron star (Flux), in a separate universe with considerably stronger gravity (Raft), and within eusocial hive societies (Coalescent).
A wormhole, or Einstein–Rosen bridge, is a postulated method, within the general theory of relativity, of moving from one point in space to another without crossing the space between. Wormholes are a popular feature of science fiction as they allow faster-than-light interstellar travel within human timescales.
Negative energy is a concept used in physics to explain the nature of certain fields, including the gravitational field and various quantum field effects.
A self-replicating machine is a type of autonomous robot that is capable of reproducing itself autonomously using raw materials found in the environment, thus exhibiting self-replication in a way analogous to that found in nature. Such machines are often featured in works of science fiction.
