What is and what could be dark energy?

There is no doubt in the science community, the expansion of the universe is accelerating! The reason behind this acceleration is one of the most challenging contemporary puzzles, and this is where the concept of dark energy comes in. Accounting for 68% of the energy in the universe, dark energy is at the same time responsible for the acceleration of the expansion of the universe. However, the crucial question remains: What could dark energy be?

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How do we know the Universe is expanding?

The idea of an expanding Universe is one of the most remarkable discoveries in the field of cosmology. It might seem counterintuitive at first, as we usually perceive the world around us as relatively static but it revolutionized our understanding of the cosmos and challenged our perception of the Universe as an unchanging entity. Let’s delve into the fascinating evidence that supports this groundbreaking idea.

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Euclid Flagship Mock Galaxy Catalog

Euclid’s core science

In the first half of July we will launch a Falcon 9 rocket into far Earth orbit, carrying Euclid – a 1.4-billion-Euro precision instrument to explore the far universe. So why is the European Space Agency spending this budget on this space mission and not, say, 200 million pieces of avocado toast, for example? In fact, there are too many great answers to this question. This blog post will only focus on one: the main goal of the mission – to increase our understanding of the dark universe.

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Red Book cover, detail

Publication: Euclid “Red Book” passes 2500 citation mark

Currently it is the most comprehensive summary of Euclid’s mission goals, its technology and science: the “Euclid Definition Study Report“, aka The Euclid Red Book. This 116 page ESA report from 2011 concludes Euclid’s initial design phase and describes Euclid at the point of adoption as a mission by ESA.

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