2023-07-31 21:05:52
Presentation of Euclid in Cannes, February 21, 2023. VALERY HACHE / AFP
The European space telescope Euclid, whose mission is to study dark matter and dark energy in the Universe, reached its observation post and delivered its first test images on Monday, July 31, taken to check the functioning of instruments and calibrate them. They are therefore not representative of the telescope’s final capabilities, but already show that it will be able to fulfill its objectives, the European Space Agency (ESA) said in a press release. Scientific operations of the telescope are due to begin in regarding two months.
“After more than eleven years of designing and developing Euclid, it is exhilarating and very moving to see these first imagessaid Giuseppe Racca, head of the Euclid mission at ESA. Once fully calibrated, Euclid will observe billions of galaxies, to create the largest 3D map of the sky ever made. »
After taking off from Florida on July 1, the European telescope, in which NASA also participated, traveled to its destination, located regarding 1.5 million kilometers from Earth. Euclid has two onboard instruments: a Visible Light (VIS) Imager and a Near Infrared (NISP) Spectrometer. The first must determine the precise shape of the galaxies, the second their distance.
Infiltrated light
But when these instruments were turned on, the scientists had a big fright: the images were “contaminated” by an unexpected light source, the ESA said. Research conducted to detect the problem has shown “that sunlight was leaking into the ship, probably through a small opening”, explained the European agency. However, to detect the faint light of distant galaxies, the bright light of our Sun (to which Euclid has its back) must absolutely be neutralized. “By rotating Euclid, the teams understood that this light was only detected at certain orientations, so by avoiding certain angles the VIS instrument will be able to carry out its mission”assured the ESA.
A photograph taken by Euclid, July 31, 2023. – / AFP
Dark matter and dark energy make up 95% of the Universe, but their nature remains a great mystery to scientists. Dark matter would ensure the cohesion of galaxies and galactic clusters thanks to its gravitational influence, while dark energy is responsible for accelerating the expansion of the Universe.
The telescope will allow precise measurements concerning the distribution of galaxies and the expansion of the Universe. The distant galaxies observed will make it possible to go back in time up to 10 billion years – the time needed for their light to reach us. The hope is that Euclid will be able to detect the traces left by dark matter and dark energy as galaxies form.
Read the decryption: Article reserved for our subscribers The Euclid mission, a hope to shed light on cosmology
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