Atomic Clock Ensemble in Space
Experiment
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| April 28 2025 | First scheduled activation of ACES to establish communications with ground control and stabilize thermal systems. |
| April 25 2025 | ACES installed on the Earth-facing side of ESA's Columbus laboratory module using the Canadian robotic arm, followed by a planned six-month commissioning phase. |
| April 21 2025 | ACES began its planned 18-30 month operations phase, externally mounted to the ESA's Columbus Laboratory. |
| April 21 2025 | ACES launched to the International Space Station on a SpaceX Falcon 9 rocket, carrying two atomic clocks: a caesium laser cooled atomic clock (PHARAO) from CNES, France, and an active hydrogen maser (SHM) from Spectratime, Switzerland. |
| 2021 | Expected launch of ACES to the International Space Station, which was further postponed due to development challenges with the active hydrogen maser and time transfer microwave system. |
| 2012 | Initial plans for launch readiness were set, though the project experienced significant delays. |
| 2012 | Initial planned launch readiness for the Atomic Clock Ensemble in Space (ACES) project, which was subsequently delayed. |
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