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Megaparsec

A megaparsec (Mpc) is a unit of distance used in astronomy to measure vast stretches across the universe. One megaparsec equals one million parsecs, or about 3.26 million light-years (1 Mpc ≈ 3.086 × 10¹⁹ kilometers). This unit is commonly used when discussing the distances between galaxies, galaxy clusters, or large-scale structures of the universe. Because the universe is so massive, astronomers need units like megaparsecs to express distances that are too large for even light-years to handle efficiently. The megaparsec is essential in cosmology and is often used when describing the scale of the observable universe.

International Nautical League

The international nautical league is a standardized version of the nautical league used in maritime navigation. It is defined as exactly 3 international nautical miles, which equals 5,556 meters or about 3.45 miles. This standardization helps avoid confusion caused by variations in historical definitions of the league. While the nautical mile remains the primary unit in modern navigation, the international nautical league provides a consistent way to measure longer distances at sea when needed.