By measuring the Hubble constant, CMB, and star populations, astronomers estimate the universe is 13.8 billion years old. Observations of distant galaxies also reveal early formation times. This dating aligns with Big Bang predictions and cosmological models. Accurate age determination helps test theories like inflation, dark energy, and structure formation. It’s like cosmic archaeology, reading the universe’s “birth certificate.”
It matters because knowing the universe’s age frames all cosmic events.
It also calibrates timelines for star, galaxy, and planetary evolution.
The universe is 13.8 billion years old, all tracing back to the Big Bang.
National Aeronautics and Space Administration [nasa.gov]