Do you know about dark matter? According to ESA, in the vast space between galaxies and stars, the seemingly empty space is filled with mysterious matter that we cannot see. This matter has a strong pull, which bends the light coming from stars as it travels to Earth. To understand this phenomenon you can imagine a prism that bends the light through refraction. This bending effect is called gravitational lensing. Scientists have watched this for a long time and realized that there is some mysterious matter and force that cannot be explained by regular things we can see, like cold hydrogen atoms. So, they gave this missing matter a name: "dark matter." It's called "dark" because it seems to only interact with light and normal matter through gravity and it cannot be seen or detected through normal sensors. Scientists have tried really careful experiments, but they haven't found any other ways that dark matter behaves. Even though they've studied it for a long time, we still don't know what dark matter is made of. It's like a puzzle that scientists are trying to solve.
ESA's Euclid mission aims to create a detailed 3D map of the Universe. Scientists will use this map to study dark energy and dark matter, which are mysterious parts of the Universe. The map will have a lot of information and will cover a big portion of the sky. It will also show how things have changed over a very long time - 10 billion years. But handling all the new data from Euclid is hard. To get ready, scientists made a super accurate computer simulation of how the Universe's big structures, like galaxies and clusters, formed and evolved. This simulation is called the Euclid Flagship. It runs on powerful computers and helps researchers understand how
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