Measuring the Cosmic Microwave Background

This chapter explores the methodologies for measuring the cosmic microwave background (CMB), contrasting ground-based telescopes like the Atacama Cosmology Telescope with satellite missions like Planck. It discusses the implications of high-resolution data and the concept of 'early dark energy' in resolving the Hubble tension, while addressing skepticism within the scientific community regarding new theories. Additionally, the chapter highlights upcoming astronomical surveys and missions that aim to enhance our understanding of dark energy and the universe's evolution.