The best alternative to dark matter and dark energy?

According to the standard model of cosmology, also known as ΛCDM (Lambda Cold Dark Matter) model, about 95% of our Universe is invisible or undetectable, or possibly both. Various alternative models have been proposed to describe our Universe without the need of dark matter or dark energy. One of them, …

A fascinating galaxy cluster

Astronomers have studied one of the most interesting galaxy clusters, Pandora’s cluster. Probably formed by complex and violent collisions, the unusual cluster has many features never seen before.
At least four galaxy clusters had to collide to form Abell 2744, or Pandora’s cluster. Its nickname comes from the multiple strange phenomena …

No dark flow in the Universe?

About three years ago, astrophysicists discovered an unexplained large-scale coherent motion in our Universe, the “dark flow”. A new study now contradicts the dark flow theory.
First observed in 2008 by a NASA team led by Alexander Kashlinsky, the dark flow describes the coherent motion of galaxy clusters. This is in …

An extremely old galaxy challenges theory

Astronomers have discovered a distant galaxy whose stars were born unexpectedly early in our Universe’s history. The observation, which would have been impossible without a cosmic gravitational lens, sheds new light on the formation of the first galaxies as well as on the evolution of the early Universe.
Clusters of galaxies …

The oldest galaxy cluster

An international team of astronomers discovered the most distant known galaxy cluster. The light coming from the cluster Cosmos-AzTEC3 was emitted when the Universe was approximately a billion years old (it is today 13,7 billion years old).
A theory confirmed
Cosmos-AzTEC3 is a “proto-cluster”, a developing group of galaxies, and it is …

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