Astronomers have known for decades that the universe is expanding. When they use telescopes to observe faraway galaxies, they see that these galaxies are moving away from Earth. To astronomers, the ...

One way to explain the Hubble tension is to modify the Lambda CDM model by changing the expansion rate at low redshift, at late times in the universe.

The prevailing model of cosmology, called the lambda-CDM model (lambda for the cosmological constant; CDM for cold dark matter—more on this in a moment), imposes an upper boundary for the age of ...

Why do 36 of Andromeda’s 37 satellite galaxies point toward the Milky Way? This strange alignment presents a serious Andromeda galaxy mystery that defies the Lambda CDM model, the leading theory of ...

For years, scientists have used a well-established model to explain how the ... two key components: Lambda (Λ), which represents dark energy responsible for the accelerated expansion of the universe, ...

Ryan Keeley does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their ...