Our Universe harbours a huge variety of fascinating phenomena and interesting objects. Neutron stars, for example, are a place of extreme physical conditions. Neutron stars continuously collide with each other in our Universe. These collisions create perfect conditions for studying the properties of ultra-dense matter, for investigating the production of heavy elements, and for conducting an independent measurement of the expansion rate of our Universe. To this end, we analyse neutron star collisions and measurements of individual neutron stars as part of multi-messenger astrophysics to reveal cosmic secrets.
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