Euclid data will enable the study of a broad range of science topics in addition to dark energy, including:
- Clusters of galaxies
- CMB Euclid galaxy survey cross-correlations
- Strong lensing statistics
- Galaxy-galaxy lensing
- Cool brown dwarfs
- Large streams and merger history of galaxies
- Study of resolved stellar populations in the Galaxy and the universe nearby
- Galaxy evolution: galaxies, AGNs, highly magnified high redshift galaxies, study of the primeval universe
- High-z Lyman Break Galaxies
- Supernovae and transients
- Exo-planets