Dawn is the transition from night to day as the sky gets brighter. Scientists distinguish between three definitions of dawn civil, nautical, and astronomical dawn. Each one is a specific moment in time, based on the solar elevation angle.
China set to retrieve Martian soil samples by 2030
China set to retrieve Martian soil samples by 2030 by Simon Mansfield Sydney, Australia (SPX) Apr 26, 2024 China is...