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We present a concept for a high-precision optical atomic clock (OAC)operating on an Earth-orbiting space station. This pathfinder science missionwill compare the space-based OAC with one or more ultra-stable terrestrial OACsto search for space-time-dependent signatures of dark scalar fields thatmanifest as anomalies in the relative frequencies of station-based andground-based clocks. This opens the possibility of probing models of newphysics that are inaccessible to purely ground-based OAC experiments where adark scalar field may potentially be strongly screened near Earth's surface.This unique enhancement of sensitivity to potential dark matter candidatesharnesses the potential of space-based OACs.

Optical Atomic Clock aboard an Earth-orbiting Space Station (OACESS): Enhancing searches for physics beyond the standard model in space