This image, captured with the NASA/ESA Hubble Space Telescope, is the largest and sharpest image ever taken of the Andromeda galaxy — otherwise known as M31. Image Credit: NASA, ESA, J. Dalcanton (University of Washington, USA), B. F. Williams (University of Washington, USA), L. C. Johnson (University of Washington, USA), the PHAT team, and R. Gendler.

Revolutionary Technique to Detect Dark Energy Close to Home

Cambridge researchers introduce a groundbreaking method by studying Andromeda for insights into the enigmatic dark energy.


Dark energy, a force accounting for over two-thirds of the universe and responsible for its rapid expansion, may be measurable closer to home, according to recent findings from the University of Cambridge. This energy, elusive since its discovery in the 1990s, might now be detected through our neighboring galaxy, Andromeda.

Milky Way and Andromeda’s Dance

Andromeda and the Milky Way’s impending collision offers an intriguing research point. The movement of these galaxies towards one another, considering their combined mass, could provide data on the cosmological constant—a basic dark energy model. Interestingly, the upper limit detected was quintuple that deduced from the universe’s early epochs.

A Closer Examination

While the strategy remains in infancy, its potential is enormous. Harnessing information from our own cosmic vicinity might finally unlock dark energy’s mysteries. These findings have been shared in The Astrophysical Journal Letters.

The observable universe is vast, but what we see—from minuscule bugs to colossal galaxies—constitutes only 5%. An estimated 27% is dark matter, binding objects, while the dominant 68% is dark energy driving objects away.


Dr. David Benisty’s Insights

“Dark energy aligns with numerous models amendable to Einstein’s gravitational theory,” stated Dr. David Benisty, the primary author. He highlighted the cosmological constant, a concept Einstein momentarily incorporated into his general relativity theory. This constant, initially zero from the 1930s to 1990s, was reevaluated when dark energy’s acceleration effects on universe expansion were unearthed.

Challenges with Dark Energy

Despite numerous detection methods since its inception, dark energy remains elusive. Its weak intergalactic force often succumbs to potent internal galactic forces. However, Andromeda’s proximity and impending merger with the Milky Way present a sensitive, promising research region.

The Future of the Research

Andromeda, contrary to other galaxies, is on a unique trajectory toward us. Its study might offer precious data on the cosmological constant and dark energy. Simulations, relying on both galaxies’ mass estimates, signify dark energy’s influence on their orbital behaviors.


With more accurate Andromeda data from the James Webb Telescope, the cosmological constant’s upper boundaries could be narrowed. Studying more galaxy pairs might sharpen the technique and shed light on dark energy’s impact. “Dark energy remains a vast cosmological enigma,” remarked Benisty, “but this method may decode its secrets.”

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Written by Ivan Petricevic

I've been writing passionately about ancient civilizations, history, alien life, and various other subjects for more than eight years. You may have seen me appear on Discovery Channel's What On Earth series, History Channel's Ancient Aliens, and Gaia's Ancient Civilizations among others.

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