The Cosmic Distance Scale is a method used by astronomers to measure distances in the universe. It employs various techniques, such as parallax, standard candles, and redshift, to determine how far away celestial objects are from Earth. Each method is suitable for different distance ranges, allowing scientists to create a comprehensive understanding of the universe's structure. One common technique is using Cepheid variables, which are stars that pulsate at regular intervals. By measuring their brightness, astronomers can calculate their distance. The scale extends from nearby stars to distant galaxies, helping us understand the vastness of space and the universe's expansion.