Economic Observation Network According to CCTV News App, the team of the US Dark Energy Spectrometer (DESI) project announced on the 15th that the project has completed a 5-year observation mission and drawn the largest high-resolution 3D map of the universe to help study dark energy and the history of cosmic expansion.

This project is funded by the US Department of Energy and operated by Lawrence Berkeley National Laboratory. The spectrometer was installed on the Nicolas Mayo Telescope located at Kitt Peak National Observatory in Arizona and began its survey mission in May 2021.

The project team stated that the dark energy spectrometer not only achieved the predetermined observation target ahead of schedule, but also observed a much larger number of galaxies and stars than expected. The spectrometer was originally planned to obtain spectral data of 34 million galaxies and quasars covering about two-thirds of the northern hemisphere sky within 5 years. However, it has actually obtained spectral data of over 47 million galaxies and quasars in this region, as well as 20 million stars in the Milky Way.

Dark energy is a type of energy that permeates the universe, generally believed to make up 68.3% to 70% of the universe and drive its accelerated expansion. The project team stated that,Analysis of the data from the spectrometer over the past three years shows that dark energy, previously considered the "cosmological constant," may have evolved over timeThis result has attracted widespread attention in the cosmological community. The complete survey dataset is expected to provide higher precision validation for relevant conclusions. In the next stage, researchers will analyze and process all observation data from the spectrometer,Expected to announce the first batch of dark energy research results in 2027?

It is reported that the spectrometer will continue to conduct sky surveys until 2028, with the observation range expanding from about 14000 square degrees to 17000 square degrees. The expanded observations will cover areas closer to the Milky Way disk and further south, which are more difficult to observe. In addition, the project will also conduct repeated observations of the observed areas to capture more distant and dim "bright red star systems", thereby constructing a more detailed map of the cosmic structure and helping scientists further understand the history of cosmic evolution.