On May 29, 2021 at 21:01 UTC (on May 30 by Beijing time) the Chinese “Tianzhou-2” unmanned supply spacecraft docked to the Chinese “Tianhe” space station core module. Tianzhou means “heavenly vessel” in Chinese. The “Tianzhou-2” delivered 6,640 kilograms of propellant and dry goods to the “Tianhe” core module. The “Tianzhou” spacecraft is similar in purpose to cargo freighters that fly to the International Space Station, such as the Russian Progress supply ship and the commercial Cygnus and Dragon carriers built by Northrop Grumman and SpaceX. In design and capability, the Tianzhou is most like Russian Progress and Europe’s now-retired Automated Transfer Vehicle, which carried dry goods, water and propellant to the orbiting outpost. The U.S. commercial supply ships and Japan’s HTV logistics vessel cannot refuel the space station.