Change

 

Sf can address any part of the cosmos, past, present or future. A lot of sf is about the future and change. "Things to come" will not be things that were. We recognize periods of great change and that we are living in one. Sf is the literature of this period. Even narratives about the cosmic past reflect recently acquired scientific knowledge.

First biological evolution, then agricultural, scientific, industrial, social, political and new technological revolutions. Some sf is about people travelling or transitioning into a changed world. Poul Anderson's Brain Wave begins in the then contemporary world but then people and society are transformed. The cause of the transformation is speculative and fictional but it reflects the fact of real change as well as cosmic interconnection.

This was meant to be a longer post but it is being cut short. Laterz.