Einstein-scalar-Gauss-Bonnet gravity has recently been known to exhibit spontaneous scalarization. In the presence of the Gauss-Bonnet term the no-hair theorem can be evaded and novel black hole solutions with non-trivial scalar fields have been found besides the general relativistic solutions. In this paper. we aim to investigate the possibility of observationally testing Einstein-sc... https://www.ealisboa.com/limited-value-AXYS-Valhalla-Pen-must-buy/