Unleashing Euclid's Full Potential: A Mission for the Ages
In the vast realm of space exploration, it's not uncommon for missions to outlive their initial expectations. The Voyager probes, for instance, continue to transmit data decades beyond their primary mission's end. However, deciding on a new purpose for these extended missions is a complex task. Euclid, a spacecraft currently mapping the enigmatic 'dark universe' of dark energy and dark matter, is set to reach its initial mission's end in 2030. But a brilliant plan proposed by scientist Luigi 'Rolly' Bedin could change everything.
Extending Euclid's Life: A Fuel-Efficient Future
Thanks to its surplus fuel, Euclid is predicted to have an extended life of around 8 years. This is a significant boost, considering its original mission was only 6 years long. Dr. Bedin's proposal is simple yet ingenious: keep Euclid doing what it does best, but for an extended period.
Why repeat the same mission? The answer lies in the concept of 'proper motion'. By obtaining a second data point after 6 years, Euclid can reveal the movement of closer objects (like stars in our galaxy) against a backdrop of more distant galaxies. This motion, when calculated over a long period, provides invaluable astronomical insights.
Gaia's Limitations: Where Euclid Shines
At this point, some might question the need for Euclid when we already have Gaia, a telescope designed to create a 3D map of our galaxy. While Gaia calculates the proper motion of stars, it has a limitation - it can't detect extremely faint objects. This is where Euclid excels. Euclid's advanced technology allows it to see objects that are five to six orders of magnitude fainter than what Gaia can detect. By utilizing Euclid as an additional astrometric observatory, scientists could uncover billions of fainter, more distant sources that Gaia alone couldn't reach, no matter the length of its mission.
Uncharted Territory: Parallax and New Discoveries
Dr. Bedin's proposal doesn't stop there. He suggests using Euclid's remaining fuel to attempt a third 'epoch' of observations, this time to calculate the 'parallax' of a select group of stars. Parallax, in astronomical terms, involves taking images of objects from opposite sides of the Sun, six months apart, to estimate their distance. This technique, while challenging for Euclid which wasn't designed for such operations, could provide groundbreaking new science.
A Simple, Elegant Solution
Dr. Bedin acknowledges the engineering challenges, but believes they are surmountable. He emphasizes that simply repeating Euclid's original mission to obtain proper motion data is straightforward, as it aligns with Euclid's initial design. With time on their side, project managers can assess the feasibility of this ambitious third epoch. At the very least, Dr. Bedin's suggestions offer a simple yet elegant way to maximize the scientific output of one of ESA's flagship missions.
The Future of Euclid: A Mission Extension to Remember
This plan to extend Euclid's mission is a testament to the ingenuity of scientists and the potential of space exploration. By maximizing the use of existing resources, we can unlock new frontiers of knowledge. So, as we look to the stars, let's remember the potential that lies within our existing tools and the brilliant minds that guide them.
Learn More:
- L. Bedin - The case for an Astrometric Mission Extension of Euclid. Extending Gaia by 6 magnitudes with Euclid covering one-third of the sky (https://arxiv.org/abs/2510.23694)
- UT - The ESA's Euclid Space Telescope Gives Glimpses of its Deep Field (https://www.universetoday.com/articles/the-esas-euclid-space-telescope-gives-glimpses-of-its-deep-field)
- UT - Euclid Could Find 170,000 Strong Gravitational Lenses (https://www.universetoday.com/articles/euclid-could-find-170000-strong-gravitational-lenses)
- UT - Euclid Recovers From a Navigation Problem and Finds its Guide Stars Again (https://www.universetoday.com/articles/euclid-recovers-from-a-navigation-problem-and-finds-its-guide-stars-again)
