There is a bright patch of red stars visible from some of the Shardworlds, called Taln's Scar on Roshar, Red Rip on Scadrial and Starbelt on Threnody.
There have been theories on whether it had something to do with the Shattering of Adonalsium, as well as associating it with Investiture corruption due to it being red
Found this interesting WoB:
Redshift occurs when stars are moving away from your point of view due to the rapid expansion of space.
Did something happen that caused an entire stellar region to get pushed outwards? The Red Rip being related to the Shattering seems more and more likely...