Cosmic distance ladder

The Cosmic Distance Ladder is a method used by astronomers to measure distances in the universe. It consists of a series of techniques, each building on the last, like rungs on a ladder. Starting with nearby objects, like parallax measurements of stars, we establish distances that help us measure further away objects, such as certain types of variable stars, which can act as "standard candles." By combining these methods, astronomers can accurately gauge distances to galaxies and other celestial bodies, helping us understand the size and scale of the universe.