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Joachim Stadel / UZH

Astrophysicists from the University of Zurich in Switzerland have built the largest simulation of the universe yet. The simulation, which was described in Computational Astrophysics and Cosmology, enables scientists to see how dark matter interacts with the universe. The photo above is part of the simulation, which highlights the dark matter halos in yellow — the dark matter that hypothetically surrounds galaxies.

How big? The simulation models more than 25 billion virtual galaxies.

Why it matters: The simulation will serve as a calibrator to help the Euclid satellite gather information from the universe. The simulation with help frame what Euclid will look for in its investigation into dark matter and dark energy. The satellite is set to launch in 2020.

How to see dark matter: Scientists believe dark matter and dark energy constitute 95% of our universe — the other 5% is what we can see, but this dark matter has remained mostly a mystery. Euclid won't be able to literally see the dark matter, but it will be looking for changes in the light as it travels the Universe. The astrophysicists' simulation predicts how dark matter and dark energy operate, which helps frame the kind of dark matter effects Euclid should be looking for and measuring.

Go deeper: Read the press release with details on how the simulation was built and Euclid's goals, here.

Go deeper

The new Washington

Illustration: Sarah Grillo/Axios

The Axios subject-matter experts brief you on the incoming administration's plans and team.

Rep. Lou Correa tests positive for COVID-19

Lou Correa. Photo: Tom Williams/CQ-Roll Call, Inc via Getty Images

Rep. Lou Correa (D-Calif.) announced on Saturday that he has tested positive for the coronavirus.

Why it matters: Correa is the latest Democratic lawmaker to share his positive test results after sheltering with maskless colleagues during last week's deadly Capitol riot. But he did not specify whether his diagnosis was connected to the siege.

Far-right figure "Baked Alaska" arrested for involvement in Capitol siege

Photo: Shay Horse/NurPhoto via Getty Images

The FBI arrested far-right media figure Tim Gionet, known as "Baked Alaska," on Saturday for his involvement in last week's Capitol riot, according to a statement of facts filed in the U.S. District Court in the District of Columbia.

The state of play: Gionet was arrested in Houston on charges related to disorderly or disruptive conduct on the Capitol grounds or in any of the Capitol buildings with the intent to impede, disrupt, or disturb the orderly conduct of a session, per AP.