Scientists made a big map of the universeuniverse/ˈjuːnɪvɜːrs/L1宇宙everything that exists, including stars, planets, and space, and it is the biggest map of the sky. The map shows stars and galaxies, and it has almost four billion objects in space. It took thirteen years to make with two big telescopes. Over one hundred scientists helped make this map. It is a beautiful picture of our universe.
Scientists use the map to learn about space because it shows so many stars. They want to study dark matterdark matter/dɑːrk ˈmætər/L1暗物质something in space that we cannot see but holds the universe together and dark energy. Dark matter is invisibleinvisible/ɪnˈvɪzəbəl/L1看不见的something that cannot be seen, but it holds the universeuniverse/ˈjuːnɪvɜːrs/L1宇宙everything that exists, including stars, planets, and space together. Dark energy makes the universe grow bigger. The map will help scientists for many years, and everyone can see it.
