Astronomers use various methods to measure distances in space, depending on the scale and distance involved. For nearby objects within our galaxy, they may use geometric techniques such as parallax or standard candles like Cepheid variables. For more distant objects, they rely on methods such as redshift (the stretching of light due to the expansion of the universe) for galaxies and supernovae, as well as the cosmic distance ladder, which combines multiple distance indicators to extend our measurement capabilities across cosmic distances. These techniques allow astronomers to map the vastness of the universe and understand its scale and structure.
Come for the Scenery, Stay for the Stars