When it comes to the intensifying rivalry between the United States and China, the sky is by no means the limit.

As the two countries jockey for economic, technological, geopolitical and even ideological superiority on Earth, space has become a natural extension -- and crucial frontier -- in their great power competition.

And due to the inherent dual-use nature of space technologies, what's at stake extends far beyond mere scientific prestige and global standing. In addition to national defense, so much of our life on Earth -- from digital communications to navigation -- depends on satellites in space.

Following the demise of the Soviet Union's space program, the US has enjoyed a period of unparalleled leadership in space. But in recent years, US observers and politicians have warned that America's dominance could soon be challenged by China's fast-growing space capabilities.

That concern has only deepened with a series of important and high profile Chinese achievements: In 2019, it became the first country to land on the far side of the moon; last year, it successfully put into orbit its final Beidou satellite, setting the stage to challenge the US Global Positioning System (GPS); and last month, it became the only country after the US to put a functioning rover on Mars.