The Apollo Program was a series of space missions conducted by the United States' National Aeronautics and Space Administration (NASA) during the 1960s and 1970s.

Astronomy is a natural science that studies celestial objects, such as stars, planets, comets, and galaxies, as well as the phenomena and processes that occur in outer space.

BeiDou is a Chinese satellite navigation system developed to provide positioning, navigation, and timing services.

Classical Antiquity refers to a period in ancient history that encompasses the civilizations and cultures of ancient Greece and Rome, as well as their neighboring societies.

Earth is the third planet from the Sun in our solar system and the only known celestial body to support life.

The Wikipedia page on the English language provides a comprehensive overview of the English language, including its history, development, characteristics, and global significance.

General relativity, also known as the general theory of relativity, is a theory of gravitation that was developed by Albert Einstein in the early 20th century.

A geodesic is a curve on a surface that represents the shortest distance between two points.