The two-ton Euclid, which is 4.7 meters (15 feet) tall and 3.5 meters (11 feet) wide, will join fellow space telescope James Webb at a stable hovering spot 1.5 million kilometers from Earth called the second Lagrangian Point.
From there, Euclid will chart a 3D map of the universe encompassing two billion galaxies across more than a third of the sky.
Euclid's gaze will stretch out to 10 billion light years away. Because of how long it takes the light from distant stars to reach Earth, that means it will peer back 10 billion years into the cosmic past.
![The Euclid space telescope. The Euclid space telescope](https://scx1.b-cdn.net/csz/news/800a/2023/the-euclid-space-teles.jpg)
The mission will allow scientists to reconstruct the history of the 13.8-billion-year-old universe via "slices of time," astrophysicist Yannick Mellier told the Euclid consortium earlier this month.
Euclid's main objective is to better understand dark matter and dark energy, which together make up 95 percent of the universe.
The existence of both remains entirely theoretical—although also necessary for scientists to construct a working understanding of the universe.
Dark matter is invisible, its existence inferred from the motion of objects affected by its gravitational pull.
Dark energy is the name given to the unknown force causing the expansion of the universe to accelerate.
Euclid is not expected to identify the true nature of these dark mysteries, but astronomers hope its unprecedented view of the universe will shed light on how they act and evolve over time.
Euclid's first images are expected to roll in quickly once scientific operations start in October, but it will take scientists longer to sift through the massive amount of data.
© 2023 AFP