  The high-precision astrometric mission GAIA recently reported the remarkable
discovery of a Sun-like star closely orbiting a dark object, with a semi-major
axis and period of $1.4\, \rm{AU}$ and $187.8$ days respectively. While the
plausible expectation for the central dark object is a black hole, the
evolutionary mechanism leading to the formation of such a two-body system is
highly challenging. Here, we challenge the scenario of a central black hole and
show that the observed orbital dynamics can be explained under fairly general
assumptions if the central dark object is a stable clump of bosonic particles
of spin-0, or spin-1, known as a boson star. We further explain how future
astrometric measurements of similar systems will provide an exciting
opportunity to probe the fundamental nature of compact objects and test compact
alternatives to black holes.
