The famed astrophysicist Carl Sagan ... alive today. Sagan was instrumental in the climate movement in the 1980s, raising concerns of global warming in Congress. In 2025, the earth’s existence ...

Carl Sagan told us that there are more stars in the universe than there are grains of sand on all of the Earth's beaches. At the same time, there are more H 2 O molecules in just 10 drops of water ...