https://phys.org/ en-us Latest news from Paris Observatory The NenuFAR Cosmic Dawn project has taken an important step in the exploration of the Cosmic Dawn, this key period in our universe marked by the formation of the first stars. An upper limit on the amplitude of the neutral hydrogen fluctuations at 21 cm from this distant time was established using the NenuFAR radio telescope. This advance represents a crucial step in our efforts to unravel the mysteries of the first stars formation. https://phys.org/news/2024-01-cosmic-dawn-nenufar.html Astronomy Tue, 16 Jan 2024 11:24:54 EST news624626692 Thanks to the latest Gaia satellite catalog from the European Space Agency (ESA), an international team led by astronomers from the Paris Observatory–PSL and the CNRS has achieved the most accurate measurement of the mass of the Milky Way. This study opens important questions in cosmology, particularly on the amount of dark matter contained in our galaxy. https://phys.org/news/2023-09-revisited-mass-milky-smaller-cosmology.html Astronomy Wed, 27 Sep 2023 12:03:28 EDT news615035004