N-Space

Normal Space, usually referred to as N-Space for short, was the name given to the prime universe of Gallifrey to distinguish it from the smaller E-Space. Alternatively, it was also known as the "third universe" (AUDIO: Quinnis) or Home D, to distinguish it from other dimensions, like Shadow-Space. (AUDIO: Masquerade) Donna Noble once referred to this universe as the Doctor's World. (TV: Turn Left) Second Reality gamers referred to this universe as fleshspace. (PROSE: Another Life)

According to the Eleventh Doctor, N-Space was born alive, but it could only become aware of itself by developing sensors across its surface, known as life forms, each of which suffered a temporary delusion of separate identity during data collection - called consciousness - but in reality had little to no individual existence. (PROSE: The Day of the Doctor) At the dawn of its formation, an abstract entity called the Solitract attempted to join the universe's laws and concepts, but it was incompatible with the other "pieces" of its existence, and threatened their coming together into a single whole. It was only after banishing it to the Solitract plane that N-Space could properly form. (TV: It Takes You Away)

According to the First Doctor, eons were but a "blink of an eye" relative to his universe's lifespan. (AUDIO: Daybreak) Indeed, the end of the universe was projected to occur in either 60,000,000,000 (AUDIO: Zagreus) or 100,000,000,000,000 AD, (TV: Utopia) and it began 13,500,020,012 years before 2109. (PROSE: Transit)

Entropy
Because of entropy, N-Space should have ceased to exist as a result of heat death some time before the 20th century in the Humanian Era, if not for the Logopolitans. The Logopolitans used Block Transfer Computations to create the CVEs to vent entropy from N-Space into E-Space. (TV: Logopolis) Sometimes the CVEs also allowed physical objects to travel from N-Space into E-Space. (TV: Full Circle)

Co-ordinates
Unlike E-Space, which used coordinates with a negative value, relative to the navigational system of the Doctor's TARDIS, N-Space used positive coordinates. The Fourth Doctor suggested, then, that N-Space was a positive universe and E-Space its negative counterpart.

The TARDIS scanner continued to show images of N-Space even after materialising on Alzarius, which had the same co-ordinates as Gallifrey, though reversed. The Doctor suggested that, rather than relaying visual information, the scanner operated off the absolute value of the co-ordinates and could not process negative coordinates. The scanner system was made functional by replacing its original N-Space image translator with one native to E-Space. (TV: Full Circle)

The Gateway, whose co-ordinates had a zero value (neither positive nor negative) served as a place of transit between N-Space and E-Space. (TV: Warriors' Gate)

Transit points
Aside from the Gateway, objects could have passed from N-Space to E-Space through a CVE, as did the Doctor's TARDIS. (TV: Full Circle) The Great Vampire travelled to E-Space from N-Space by means unknown, as did the human ship, the Hydrax. The Doctor surmised that the Hydrax was intentionally brought into E-Space by the Great Vampire. (TV: State of Decay)

N-Space existed side-by-side with a reservoir of evil that was made of manifest suffering and fear. There were weak points that Dr Colin Dove termed "synapses" through which, at perihelion when the two worlds were at their closest, the evil force could come through with the help of powerful sensitives. The land that Hawthorne was built upon was one such example. (HOMEVID: The Zero Imperative)

Universal trends
The Twelfth Doctor claimed that the Time Lords were the "most civilised civilisation" in the universe. (TV: World Enough and Time)

The Thirteenth Doctor claimed that a Dalek was the most dangerous creature in the universe. (TV: Resolution) Earlier, the Twelfth Doctor "welcome[d]" Clara Oswald to "the most dangerous place in the universe" when they entered the inside of a Dalek. (TV: Into the Dalek)

The Eleventh Doctor considered the Romans to be the greatest military machine in the history of the universe, greater than even the Daleks. (TV: The Pandorica Opens)

Jack Harkness recalled an Earth saying, taught to him by "a very old, very wise friend", "an injury to one is an injury to all". He went on to claim that when people acted according to that philosophy, the human race was the finest species in the universe. (TV: Children of Earth: Day Four) Earlier, he claimed that that humans were the only race to go camping. (TV: Countrycide)

Warning Ianto Jones against his cyber-converted girlfriend, Lisa Hallett, Jack told him that the Cyber-race would be spreading out across the universe before he knew it. (TV: Cyberwoman)

Kaagh, of the Tenth Sontaran Battle Fleet, believed that power was the most beautiful thing in the universe. (TV: Enemy of the Bane)

Sarah Jane Smith believed that, in all the universe, only the Doctor could know straight away and help fix the Trickster's perversion of history. Ultimately, however, Sarah Jane was forced to stop the Trickster without him on that occasion. (TV: The Temptation of Sarah Jane Smith)

In 2009, Major Cal Kilburne, actually an undercover Bane, told Sir Alistair Gordon Lethbridge-Stewart that UNIT had to adapt to the challenges of a more hostile universe. Alistair, who served decades prior, considered that it did not get more hostile than in his day. Considering the prospect of joining UNIT, Clyde Langer was "ready to fight the scum of the universe."

Mrs Wormwood suggested that Luke Smith was "quite unique throughout the entire universe. Alone in its darkness, without blood kin. Just as I am." (TV: Enemy of the Bane)

Sarah Jane observed that once one had "seen the universe for real", nothing ever look[ed] quite the same again." Androvax, who lost his homeworld, believed that the only truth of the universe was death and destruction, noting that all worlds would inevitably die. Luke acknowledged that there was destruction in the universe for billions of years. However, he noted that without destruction, the universe would not evolve, and that survival was really what the universe was about. Sarah Jane concurred: "Parts of the universe are dying all the time. Planets, stars, people. But the amazing part is that it isn't the end. It's only the beginning of something new and exciting being born."

- Sarah Jane Smith

She went on to claim that the "wonderful thing" about the universe was that "you just never know". (TV: Prisoner of the Judoon)

Eve was surprised to find that humans liked being scared, observing that the universe was full of nightmares and they made fake ones. (TV: The Mad Woman in the Attic)

According to Mr Smith, the Shansheeth were known throughout the universe as the carers of the dead. (TV: Death of the Doctor)

Other references
Jack Harkness observed that the Sex Gas travelled "halfway across the universe for the greatest sex" and still ended up dying alone. (TV: Day One)

Before his memory was wiped, Mr Smith wished to "let the universe witness the power of the Xylok once more." He believed that the universe was better served by the survival of the Xyloks over the human race. (TV: The Lost Boy)

Jack Harkness boasted that he had "seen the universe." (TV: The Blood Line) He was told by Toshiko Sato, a fellow member of Torchwood Cardiff, that he had shown her the wonders of the universe. (TV: Exit Wounds)

Rupesh Patanjali recalled a woman who took her own life after the revelation of alien life to humanity, explaining that she saw her place in the universe to be tiny. (TV: Children of Earth: Day One)

The Tenth Doctor noted that the Trickster was a creature from beyond the universe, "forever trying to break in to our reality, manifest himself." (TV: The Wedding of Sarah Jane Smith)

Sarah Jane observed that Androvax raged against the universe for the loss of his people. Clyde considered if a whole race of "body-popping aliens" was good for the universe, while Sarah Jane told him that Androvax's crimes did not mean his species was better off extinct. (TV: The Vault of Secrets)

Sarah Jane claimed that "in all the universe I never expected to find a family." (TV: The Lost Boy, The Man Who Never Was)

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