Jump

"Fail their jump time, and they would have been in the jump range when something else came in, and that was disaster."

-CJ Cherryh, Downbelow Station (New York, 2001), BOOK TWO, Chapter 4, p. 162.

See Time Travelling And Space Jumps II.

Wells, Anderson and Cherryh warn us of the danger of occupying the same space as another material object. I think that the Doctor did this once and was blown out of time into the realm of the god of time. In fact, I have just found some relevant previous posts. See here.

A background remark in an sf novel can form part of a literary and conceptual tradition which can stretch back to Wells.