For those curious:
What can Euclid do that the James Webb Space Telescope cannot?
Where Webb can observe extremely far back in time and zoom into the details, Euclid can go fast and wide. In a single observation Euclid can record the data from an area of the sky more than one hundred times bigger than that imaged by Webbโs camera, NIRCam. This means that Euclid can map a third of the sky to the required sensitivity in six years in space โ a feat that would be impossible with Webb.
- Esa.int