Above the islands of Hawaii on January 28, a green laser was seen piercing the night sky, silently tracing a path towards the horizon like a stutter in the Matrix's code. The scene was caught on camera from a telescope atop Hawaii's tallest peak. Originally, experts at the National Astronomical Observatory of Japan (NAOJ), which co-owns the camera, announced on Twitter that the green light probably came from a radar device on an orbiting satellite, known as ICESat-2. "According to Dr. Martino, Anthony J., a NASA scientist working on ICESat-2 ATLAS, it is not by their instrument but by others," a note on the YouTube video explains. "His colleagues, Dr. Alvaro Ivanoff et al., did a simulation of the trajectory of satellites that have a similar instrument and found a most likely candidate as the ACDL instrument by the Chinese Daqi-1/AEMS satellite. "Daqi-1 can monitor fine particle pollution like PM2.5, pollutant gasses including nitrogen dioxide, sulfur dioxide and ozone, as well as carbon dioxide concentration," a March 2021 press release from the China Aerospace Science and Technology Corporation, which developed Daqi-1, explained.