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The Atomic Clock Ensemble in Space (ACES) is a project led by the European Space Agency (ESA), placing ultra-stable atomic clocks on the International Space Station (ISS). It was launched and installed on the Columbus External Payload Facility in April 2025. Operation in the microgravity environment of the ISS provides a stable and accurate time base for different areas of research, including general relativity and string theory tests, time and frequency metrology, and very long baseline interferometry.
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