Red Shift

A red-shift in the light from a star shows that the distance between us and the star is increasing. The bigger the red-shift the faster the star is moving away.

Student: "Teacher what is red shift?"
Teacher: "Red shift is the wavelength of the light that is stretched, so the light is seen as 'shifted' towards the red part of the spectrum. "

by Dr. Annole March 21, 2023

retshift

Something that fundamentally shifts a setting or story's fundamental identity, retroactively. Typically, they are also incoherent, and/or for marketing purposes.

"Dude, did you see those female Space Marines?"
"Yeah, they're a total retshift."

by antiswitcher July 8, 2025