What is the distance of Cas A from Earth?

Cassiopeia A, commonly referred to as Cas A, is one of the most studied supernova remnants in our galaxy. The distance to Cas A has been measured using various methods, including parallax measurements and observations of its optical and X-ray emissions. Current estimates place Cas A at approximately 11,000 light years from Earth, making this the most accurate and widely accepted distance among astronomers.

The significance of the 11,000 light year distance is also highlighted by the remnant's visibility and its position in the Milky Way. Being a prominent example of a supernova remnant, studying Cas A helps astronomers understand the processes of stellar evolution, supernova expansion, and cosmic element distribution in our galaxy. Other distances listed in the choices do not align with the most recent astrometric data, which reinforces the accuracy of the 11,000 light year estimate.