Teleology is the idea that some processes in nature are directed toward a goal or an end. Today, it is commonly asserted that ...

Physicist Richard Lieu first explored the idea that gravity could exist without mass—now he’s got a new cosmological model that eschews the need for dark energy.

In recent years, one of the most troubling puzzles in astrophysics has grown more urgent. Scientists have realized that the ...

For decades, astronomers have relied on Einstein’s theory of relativity to explain the expansion of the universe, assuming that dark energy—a mysterious force making up 70% of the cosmos—remains ...

Because when we found that the accelerated expansion is happening, we want something that can push everything apart. What can do that?Einstein’s cosmological constant pushes things apart.

Leading this quest is the Dark Energy Spectroscopic Instrument (DESI), a global collaboration that maps the universe's 3D large-scale structure by measuring redshifts of tens of millions of celestial ...

More information: DES Collaboration, Dark Energy Survey: implications for cosmological expansion models from the final DES Baryon Acoustic Oscillation and Supernova data, arXiv (2025). DOI ...

Since its discovery in 1998, dark energy has been considered a cosmological constant, an unchanging force explaining the acceleration of the Universe's expansion. However, recent results from the Dark ...

We could have seen the standard cosmological model breaking,” says ... the discrepancy between the rate of expansion in the universe given by the lambda-CDM standard model and what we measure ...

Dark energy, this still mysterious force that accelerates the expansion of the Universe, may have reversed in the distant past. This bold hypothesis, proposed in a new study, could explain some ...

This graphic shows the emergence of a cosmic web in a cosmological simulation using ... clock would run faster and allow more time for the expansion of space. The lighter purple regions are ...