space science and tech
Space : Space Science And Technology Blue‑Sky‑4 VS Lightbus Cost
China’s Blue Sky-4 solar sail satellite reduces launch expenses by roughly 45 percent compared with the Lightbus platform while delivering about three times the propulsion force per kilogram. In 2023, the Blue Sky-4 test demonstrated a 5 km/s velocity increase in 12 days, proving continuous thrust of 0.