The world followed NASA’s Artemis 2 moon mission in near real-time thanks to a high-tech laser link between the Orion spacecraft and Earth that beamed back high-definition streaming video and images from lunar distance for the first time.
Transmitting data optically using infrared light, a technique known as “lasercom,” was at the heart of what made Artemis 2 so publicly engaging. High-resolution imagery was made available on a daily basis throughout the 10-day mission, making it feel as though the public was riding alongside commander Reid Wiseman, pilot Victor Glover, and mission specialists Christina Koch and Jeremy Hansen every step of the way on their voyage around the moon.
The system that made this possible is called the Orion Artemis 2 Optical Communications System, or O2O, developed by researchers at MIT’s Lincoln Laboratory. Using an infrared laser, O2O transmitted data to Earth at bit rates of up to 260 megabytes per second, faster than some home broadband internet connections.
Why lasers beat radio
Infrared signals were chosen over traditional radio for several reasons. Near-infrared light can pass through thin clouds, meaning an obscured sky would not prevent communication. More fundamentally, optical light operates at a much higher frequency than radio, enabling far more data to be packed into the signal.
Lasers can transmit 10 to 100 times more data per second than radio waves, and the O2O team believes the system can be improved by at least another factor of 10 over what was achieved during Artemis 2. This is why even the search for extraterrestrial intelligence (SETI) is now looking for optical signals alongside traditional radio searches.
“Our goal was to demonstrate O2O’s operational utility for human spaceflight, extending the high-bandwidth connections that Internet users enjoy on Earth to astronauts in deep space,” said Farzana Khatri, lead systems engineer in Lincoln Laboratory’s Optical and Quantum Communications Group. “We not only demonstrated the first use of a lasercom on a crewed mission beyond low Earth orbit, but also attracted massive public engagement as the astronauts shared multimedia from their journey in near real-time.”
How O2O works
The O2O system is composed of three modules. The optical module features a 4-inch (10-centimeter) telescope that focuses the laser beam, mounted on a gimbal to help point it precisely at the receiving ground station. A second module contains a modem that converts electronic data into optical data for transmission. The third module is a controller that interfaces with the Orion spacecraft to help with precise pointing.
The laser targeted one of three ground stations. The primary stations were NASA’s White Sands Test Facility in New Mexico and the Jet Propulsion Laboratory’s Table Mountain Facility in California, with a third experimental station at the Australian National University’s Mount Stromlo Observatory.
Initially the operating window was limited to about one hour per day, but O2O proved so effective that NASA mission managers adjusted the Orion capsule’s attitude at times to extend the line-of-sight window, allowing even more data to be downlinked. In total, O2O transmitted half a terabyte of data over the mission’s 10 days.
Preserving the data
Beyond the public engagement benefits, O2O served a critical scientific purpose. Every image and video stored on the spacecraft’s cameras could be downlinked in real-time, allowing mission control to erase the memory cards and refill them for new captures. This protected the data against corruption or loss during the capsule’s reentry and recovery.
“For any space mission, scientists and spacecraft engineers are concerned that data not sent down during the mission can become corrupted or get destroyed,” Khatri said. “And when the spacecraft capsule returns, downloading the data can sometimes take months. The lasercom capability provided by O2O ensured the data were preserved and immediately available for analysis.”
From the ISS to the moon
O2O has its roots in earlier laser communications experiments. The Lincoln Laboratory team previously developed the Modular, Agile, and Scalable Optical Terminal (MAScOT), which flew to the International Space Station and was tested for the first time in 2023. That built on even earlier work including NASA’s Optical Payload for Lasercom Science (OPALS) instrument, which beamed a 165-megabit video from the ISS in 2014.
O2O represents a significant evolution from these predecessors, adapted for the greater distances and operational demands of lunar flight. The iconic images from Artemis 2, nicknamed “Hello, World” and “Earthset,” did not happen by accident. The crew had been trained at NASA’s Johnson Space Center in Houston specifically to observe and photograph the moon and Earth, and O2O ensured their best images could be shared across the world within hours of being taken.
What comes next
Khatri believes O2O’s data rate can be increased by at least 10 times in future missions. This enhanced capability will allow the world to follow upcoming Artemis missions even more closely. When astronauts next step onto the lunar surface, laser communications will ensure the world can watch in high definition.
O2O transmitted at 260 megabytes per second from lunar distance, but future lasercom systems could push toward gigabit-per-second rates, enabling live 4K video streaming from the lunar surface — a capability that would transform how the public experiences deep space exploration.