Those images are just amazing, especially with the 3 zoom ins! I was curious how Euclid and Gaia differ and complement each other. Gaia's survey has been on-going since 2013. Here's a link to the ESA article about Euclid:
Euclid was primarily designed to study the composition and evolution of the Universe at the largest scales. However, Euclid's unprecedented survey will also be a treasure trove of information about the physics of individual stars and galaxies.
www.esa.int
Some noteworthy bulletpoints:
Euclid has a four times higher resolution, and 15 times better sensitivity in the near-infrared than is possible from current ground-based surveys.
Euclid sees in the visible and near-infrared whereas Gaia is visible light only. So Euclid will be able to see objects like brown dwarfs and ultra-cool stars that are invisible to Gaia.
While the majority of time Euclid will be performing a wide-field survey, 10% of its time will be "staring" continuously over time at 3 different patches of sky and will be able to see objects that are hundreds of times fainter than the ones Gaia can detect.
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