Area of Measurement (Cepheid Variables)

Cepheid variables are a type of star known for their unique brightness fluctuations over regular time intervals. By studying these stars, astronomers can determine their distance from Earth. The relationship between a Cepheid’s brightness and its pulsation period allows scientists to calculate how far away they are, serving as a "cosmic yardstick." This measurement is crucial for mapping the universe and understanding the scale of galaxies and other celestial objects, fundamentally aiding in the study of cosmic expansion and the structure of the universe.