Dark Energy

Mysterious repulsive energy comprising ~68% of the universe, driving its accelerating expansion.

Core Principles & Analysis

• Two rival supernova teams discovered the accelerating expansion in 1998, earning the 2011 Nobel Prize in Physics.
• Its simplest explanation is Einstein's cosmological constant, a constant energy density of empty space.
• Results from the DESI survey in 2024-2025 hint that dark energy's strength may be weakening over cosmic time.

Specifications & Metrics

• EVIDENCE: Type Ia supernovae redshift surveys (1998)