Earth-moon space laser communication verified at 248,000-mile distance
SMRTR summary
Threading a needle from a thousand miles away. That's how Yang Lei, head of China's CSU laser test team, described the challenge of connecting Earth and the Moon with high-speed laser beams.
Chinese scientists have done exactly that, successfully testing a two-way laser communication link spanning 400,000 kilometers between Earth and lunar orbit. The breakthrough delivers download speeds of 100 Mbps, enough to stream live HD footage from the Moon in real time.
The feat required engineering around two brutal obstacles: microscopic spacecraft wobbles and atmospheric shimmer that can deflect a laser beam miles off course, and a signal so faint by arrival that receivers catch just a handful of photons per second amid the chaos of moonlight and city glare.
With China planning a permanent lunar base by the 2030s, this optical link becomes critical infrastructure. NASA is pursuing parallel efforts toward Mars. Together, they signal something significant: the age of radio signals guiding our space missions may quietly be coming to an end.
SMRTR provides this summary for quick context. The original article belongs to Interesting Engineering.
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