Unraveling Dark Energy

This chapter explores the pivotal contributions of the Dark Energy Spectroscopic Instrument (DESE) in mapping the universe's structure and the insights gained from its first-year data collection. It discusses the nature of dark energy, its implications on cosmic expansion, and presents various potential fates of the universe, including the 'big freeze' and 'big rip'. Furthermore, it emphasizes the need for ongoing research to address the discrepancies between theoretical models and observational data, redefining our understanding of dark energy.