What if Jupiter's icy moon Europa orbited Earth as a second moon? Europa sits at roughly 671,000 km on the far side of Earth from our Moon — about 1.7 times the Earth–Moon distance. Europa's 4.8-day orbital period and substantial mass (0.008 Earth masses) would introduce strong tidal forces, potentially destabilising the inner moon's orbit over time. The two moons would periodically align, creating extreme tidal bulges in Earth's oceans and crust. Europa's subsurface ocean and icy shell would make it the brightest object in Earth's night sky after the Moon itself. The scenario tests the long-term stability of a two-moon Earth in the real Solar System gravitational environment.