NASA astronauts Christina Koch and Jessica Meir made history Wednesday by conducting the first radio communication between a lunar mission spacecraft and the International Space Station while positioned thousands of miles apart in space.

The unprecedented spacecraft-to-spacecraft call marked a significant milestone in space communication capabilities, demonstrating the ability to maintain contact between different NASA missions operating simultaneously in space.

Koch and Meir, who have been referred to as "astro sisters" due to their collaborative work in space exploration, used the radio connection to catch up during their respective missions. The successful communication test showcases advancing technology that enables real-time contact between astronauts on different space missions.

The achievement comes as NASA continues its lunar exploration efforts while maintaining operations aboard the International Space Station. The ability to establish direct communication links between various spacecraft represents an important advancement for future coordinated space missions.

Both astronauts have previously made significant contributions to space exploration, with their successful radio call adding another milestone to NASA's ongoing space operations and communication capabilities.