Euclid Telescope Maps 900M Galaxies, Unveiling Cosmic Secrets

The European Space Agency (ESA) has released a substantial collection of data from its Euclid telescope, offering unprecedented insights into the universe's large-scale structure. This initial release encompasses observations of over 900 million galaxies, a significant milestone in Euclid's mission to create the most detailed 3D map of the cosmos to date.

The mission, launched in 2023, is focused on understanding the mysterious components of dark matter and dark energy, which constitute the vast majority of the universe's contents. Euclid achieves this by meticulously measuring galaxy distances and observing how the universe has expanded and evolved over billions of years.

A key tool in this research is gravitational lensing, where the gravity of foreground matter bends light from distant galaxies. The new data set features approximately 15,000 strong gravitational lens candidates, a number that dramatically surpasses all previous discoveries combined. These lenses act as cosmic scales, helping scientists map the distribution of invisible dark matter and understand galaxy formation.

Euclid's capability to capture sharp images over vast areas of the sky, unimpeded by Earth's atmosphere, distinguishes it from other telescopes. This allows for the identification of rare phenomena, such as strong gravitational lenses, and has enabled the pinpointing of 60 million quasars, some dating back to when the universe was only 5% of its current age.