Определение galilean satellite в Английский Язык Английский Язык словарь
Any of the four large satellites of Jupiter discovered by Galileo in 1610. In order of distance from Jupiter: Io (the most volcanically active body in the solar system), Europa (suspected to contain a liquid ocean under its frozen surface), Ganymede (the largest satellite in the solar system), and Callisto. Both Ganymede and Callisto are larger than Pluto and Mercury