Q. Recently, which country developed the world’s first satellite series (Tiantong-1)?
Answer:
China
Notes: Chinese scientists launched the Tiantong-1 satellite series, pioneering satellite-enabled smartphone calls without ground infrastructure like cellular towers. The Tiantong-1 comprises three satellites in geosynchronous orbit at ~36000 km altitude, covering the Asia-Pacific from the Middle East to the Pacific Ocean. Huawei released the first smartphone supporting satellite calls in Sep 2023, connecting directly to the Tiantong satellites. Geosynchronous orbit ensures satellites match Earth's rotation.