Dark Energy

In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales. The first observational evidence for its existence came from measurements of supernovas, which showed that the universe does not expand at a constant rate; rather, the universe's expansion is accelerating. Understanding the universe's evolution requires knowledge of its starting conditions and composition. Before these observations, scientists thought that all forms of matter and energy in the universe would only cause the expansion to slow down over time. Measurements of the cosmic microwave background suggest the universe began in a hot Big Bang, from which general relativity explains its evolution and the subsequent large-scale motion. Without introducing a new form of energy, there was no way to explain how scientists could measure an accelerating universe.

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Physicists Discover a New Approach for Solving the Bizarre Dark Energy Mystery

Dark Energy Camera Unveils Billions of Celestial Objects in Unprecedented Survey of the Milky Way

More than 10,000 volunteers in 85 countries helped astronomers to identify about 240,000 galaxies, in a quest to observe dark energy

Amateur astronomers 'swipe right' to hunt dark energy and ID nearly a quarter million galaxies

Explaining the Universe’s accelerated expansion without dark energy

“Early Dark Energy” Could Explain the Crisis in Cosmology

Construction starts in Australia on the world's largest radio telescope | The Square Kilometer Array will help study dark energy and the early universe.

What is dark energy?

The Hubble Tension and Early Dark Energy

The Top 15 Most Stunning Photos Taken by the Dark Energy Camera

Supernova Explosions Reveal Precise Details of Dark Energy and Dark Matter

Astronomers Chart the Influence of Dark Matter and Dark Energy on the Universe by Measuring Over 1,500 Supernovae

The most precise accounting yet of dark energy and dark matter

The most precise accounting yet of dark energy and dark matter

1,500 supernovas offer most precise survey of dark energy and dark matter to date

The Dark Energy Camera has Captured a Million Images, an Eighth of the Entire sky. Here are Some of its Best Pictures so far

A cosmic Lobster seen by the Dark Energy Camera

Dark Energy Camera Celebrates Its 10th Birthday with Stunning Photo of Lobster Nebula

On its Hunt for Dark Energy, a Telescope Stopped to Look at the Lobster Nebula

'Lobster Nebula' glows red in stunning new image from dark energy hunter