Chinese satellites complete groundbreaking mission 22,000 miles above Earth

China's space program took a major stride this past week as two of its satellites seemingly docked together in what could have been the country's first high-altitude attempt at refueling a satellite while in orbit.

The Shijian-21 and Shijian-25 satellites appeared to dock with one another last week more than 20,000 miles above the planet in geosynchronous orbit, in which a satellite's orbital period matches the pace of the Earth's rotation, according to news outlet Ars Technica.

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