Factual error: Ida, the science officer, says that the planet is in geostationary orbit around the black hole. However, the word "geostationary" applies very specifically to objects orbiting the planet Earth. Since a black hole is a type of star, this planet's orbit could be described as astrostationary, or even just stationary, but definitely not as geostationary. A science expert on an interstellar mission wouldn't make this mistake, and she wasn't dumbing things down, either, since "geostationary orbit" is already a pretty obscure topic for people unfamiliar with space technology.
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Lumic: What is your name?
Doctor: I'm the Doctor.
Lumic: A redundant title. Doctors need not exist. Cybermen never sicken.
Doctor: Yeah, but that's it! That's exactly the point! Oh, Lumic, you're a clever man...I'd call you a genius, except I'm in the room. But everything you've invented, you did to fight your sickness. And that's brilliant. That is so human. But once you get rid of sickness and mortality, then what's there to strive for? Eh? The Cybermen won't advance. You'll just stop! You'll stay like this forever. A metal Earth with metal men and metal thoughts. Lacking the one thing that makes this planet so alive. People. Ordinary, stupid, brilliant people.
Trivia
At the end of the episode "Voyage of the Damned", Astrid is set loose to travel through space and time. Astrid is an anagram of TARDIS, which does the same thing. See more...
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