This special issue highlights the vital role of geoscience communication in bridging Earth, space, and society to address shared sustainability challenges. Contributors present diverse perspectives on applying sustainable practices to space missions, leveraging space technology to monitor and respond to global issues, integrating ethical and policy frameworks, and pioneering new media to make space scientific knowledge accessible. By emphasizing cross-disciplinary collaboration and curriculum innovation, the collection offers a forward-looking vision regarding how research and higher education can jointly foster responsible technological progress, protect our planet, and cultivate humanity's capacity to explore and thrive beyond Earth.