The size of the universe is not precisely known, and our understanding of its true extent is limited by the observable universe. The observable universe refers to the portion of the universe that we can potentially observe from Earth given the current age of the universe (approximately 13.8 billion years) and the speed of light.
As of our current knowledge, the observable universe is estimated to have a diameter of about 93 billion light-years. However, it's important to note that this measurement refers to the distance that light could have traveled since the Big Bang, not the current size of the universe. The universe is believed to be much larger than the observable universe, and its actual size remains a topic of ongoing scientific research and debate.
In terms of mapping the universe, astronomers have created detailed maps of large-scale structures, such as galaxies and galaxy clusters. These maps are constructed based on observations from telescopes and satellite missions. Projects like the Sloan Digital Sky Survey and the Planck satellite mission have contributed significantly to our understanding of the large-scale structure of the universe.
However, when it comes to mapping the universe on a smaller scale or capturing the finer details, our current capabilities are limited. The universe is a vast and complex place, and mapping its intricate details, such as individual stars and planetary systems throughout the cosmos, is a monumental task that is not currently feasible with our technology.
Nevertheless, advancements in telescopes, observational techniques, and data analysis methods continue to improve our maps of the universe. Ongoing and future missions, such as the James Webb Space Telescope and the Large Synoptic Survey Telescope, are expected to provide increasingly detailed insights into the universe, further expanding our knowledge of its structure and contents.