Millennium Nucleus for the

Evolutionary Reconstruction of the InterStellar medium (ERIS)

Project description

ERIS applies one of the principles of Darwin’s Theory of Evolution – descent with modification – to cosmic evolution.

With ERIS we aim to reconstruct the evolution of galaxies like the Milky Way using the phylogenetic trees, which are already extensively used in other evolutionary studies on Earth. Since trees are mathematical structures and graphs, with ERIS we are consolidating an interdisciplinary collaboration between astronomers, biologists and mathematicians, in order to achieve our goal. We will reconstruct the evolution of the Milky Way, our main galactic laboratory, by building and interpreting phylogenetic trees that are appropriate for astronomical data. To do so, we will simulate the evolution of galaxies, where we know their shared history. We will also use observed data, which will allow us to learn to deal with uncertainties, and ultimately help us to constrain the theory of galaxy evolution.

On-going projects

Phylogenetic signal in spectroscopic surveys. One of the main motivations to generate large spectroscopic surveys

What do phylogenetic trees tell us about the merging history of the Milky Way?  Building

Cosmic phylogeny from first principles. Fossil data is extremely imperfect. In addition to limited and


Our team

More information about us and the rest of the team.


The Núcleo Milenio ERIS, together with the European Southern Observatory (ESO) hosted a workshop entitled “Extending the Gaia Benchmark stars” throughout November. …

The Co-director of the ERIS Millennium Nucleus and astrophysicist, Patricia Tissera, was announced during the month of August with the award of …

Gaia is a space observatory launched by the European Space Agency (ESA) whose mission is to create a detailed map of the …

Interdisciplinary work beyond the scientific community:

Gen universal