This photo taken on April 13, 2023 shows a researcher adjusting a vacuum test device for micro-pixel-level star distance measurement technology in Beijing, capital of China. (Purple Mountain Observato
Enjoy life, Inspiring work
Enjoy life, Inspiring work
This photo taken on April 13, 2023 shows a researcher adjusting a vacuum test device for micro-pixel-level star distance measurement technology in Beijing, capital of China. (Purple Mountain Observato