- dark matter
- Seeing dark matter in the Andromeda galaxy, Vera Rubin, Physics Today, December 2006
- Rotation of the Andromeda Nebula from a Spectroscopic Survey of Emission Regions, Vera C. Rubin and W. Kent Jr. Ford, Astrophysical Journal,, Vol. 159 (1970): 379.
- gravity on a flat earth
- Is Earth Actually Flat? Vsauce. YouTube (4 December 2014).