https://spaceref.com/science-and-exploration/chi-cygni-expands-and-dims-and-then-contracts-and-brightens-over-408-days/
Chi Cygni expands and dims, and then contracts and brightens over 408 days - SpaceRef
Dec 21, 2009 - Space news and reference site.
chi cygni
https://spaceref.com/tag/chi-cygni/
Chi Cygni Archives - SpaceRef
Space news and reference site.
chi cygniarchives