Astronomy: By far the largest 2D map of the night sky has been completed

An international team of researchers has released what they claim is the largest two-dimensional map of the night sky ever created. The map, based on over 263,000 images taken by three observatories in the United States and Chile, includes nearly four billion celestial objects. It covers approximately 75 percent of the entire visible and near-infrared portion of the night sky. The data was made publicly accessible through an online portal, allowing both professionals and amateurs to access and utilize the information. The project, part of the DESI Legacy Imaging Surveys, serves as a foundation for the Dark Energy Spectroscopic Instrument (DESI), which has been working for years to create the largest three-dimensional map of the universe. This 2D map provides detailed positional and brightness data for galaxies, which is essential for selecting observation targets within the DESI program. Additionally, the map will serve as a reference for other observatories, including the already operational Vera C. Rubin Observatory and the upcoming Nancy Grace Roman Space Telescope, set to launch in late August. The newly released map can be used by astronomers and anyone with an interest in the cosmos to better understand the universe. It allows for the identification of rare phenomena such as gravitational lenses and transient events like supernovae. Researchers have already published more than 1,800 scientific papers based on previous releases of the data, and this number is expected to grow significantly with the new release. The map focuses on the extragalactic universe, avoiding obstruction from interstellar dust and stars within our Milky Way galaxy. Just months ago, the DESI completed its primary mission and collected all necessary data to produce the most comprehensive and accurate three-dimensional map of the universe. However, the team continues their work and plans to expand their 3D map by 20 percent by 2028. A preliminary result released almost 18 months ago suggested that dark energy might change over time, challenging existing theories. The complete dataset is expected to confirm or refute this groundbreaking hypothesis, with major findings anticipated for the coming year. The significance of this achievement lies in its potential to advance our understanding of cosmic structures and the nature of dark energy. By providing such a vast and detailed resource, the map supports ongoing research into the fundamental forces shaping the universe. As the scientific community begins to explore these data, further discoveries could reshape our knowledge of the cosmos. The availability of this information underscores the collaborative effort among global observatories and highlights the growing accessibility of astronomical resources to a broader audience.