ACES will gather ultra-precise data across at least ten observation windows, each lasting about 25 days during the 30-monthsmission.
The European Space Agency has launched one of its most precise science experiments to date — the Atomic Clock Ensemble in Space —to the International Space Station .This is no ordinary clock — it’s a highly precise instrument built to put Einstein’s theories of special and general relativity to the test.
ACES will measure time with unmatched accuracy, aiming to confirm how time bends, slows, and stretches under different cosmic conditions.According to special relativity, the faster an object moves, the more slowly time passes for it. General relativity explains that time also slows down the deeper something is in a gravitational field.That means the ISS, orbiting Earth at 8 kilometers per second and far from its gravitational grip, experiences time ever so slightly differently than we do on the ground. The differences are minuscule — fractions of a second — but crucial.ACES will catch these elusive ticks and tocks, not only validating Einstein’s genius but potentially uncovering cracks in our understanding of time itself.Time diverges in orbitIt will run its experiments over the next 30 months aboard the ISS. During this period, ACES will gather ultra-precise data across at least ten observation windows, each lasting about 25 days. Its clock signals will be transmitted back to Earth using two distinct methods, which will then be matched against ground-based atomic clocks to catch even the tiniest drift.The most precise timekeepers ever built are optical clocks, which can measure time to within a few parts in a billion billion — and they’re only getting better. While ACES won’t quite reach that level of precision, its instruments are still groundbreaking. In the world of satellite systems, nothing has ever come this close to perfect timekeeping.This leap in precision will allow scientists to test time dilation like never before and explore whether the fundamental constants of nature are truly constant. ACES could even help probe certain mass ranges of dark matter and offer insights into Earth’s internal structure.PHARAO ClockAt the heart of the mission are two advanced atomic clocks. One is PHARAO , a cesium-based clock designed to be compact in microgravity, unlike its bulky Earth-based counterparts.The other is SHM, or Space Hydrogen Maser, which keeps time using microwaves and hydrogen atoms. Think of it as the microwave version of a laser — precise, stable, and ideal for space science.Clocks that challenge physicsTogether, these two clocks are so precise, they’d lose just one second every 300 million years. The entire system will be mounted outside the ISS’s Columbus module, carefully positioned using the station’s robotic arm.“ACES is a highly sensitive apparatus made of intricate and interconnected subsystems that must work in harmony. The team faced many challenges and had to devise clever solutions,” said Thomas Peignier, ACES Principal Engineer, in a release.“For example, to prevent the clocks from being damaged by exposure to magnetic fields, we conducted magnetic surveys before moving ACES anywhere, used special equipment to protect ACES during testing, and all tools, electronic devices and metallic pieces, down to the very nuts and bolts, are measured and demagnetised if necessary before they go near ACES.”“It is high-precision work for a high-precision facility.”“We are thrilled by the opportunities that the clock network established by ACES will bring for fundamental physics research, geodesy applications and global timekeeping,” ESA’s ACES project scientist Luigi Cacciapuoti said in a statement.“ACES is today responding to an urgent need in the scientific community and will surely play a key role in pushing towards the re-definition of the standard unit of time – the so-called SI second –, in terms of an optical frequency standard.”
Atomic Clock Dark Matter In Terms Of An Optical Frequency Standard.” ESA ISS PHARAO Relativity SHM Space Science Time – The So-Called SI Second – Time Dilation
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