In January 2003, scientists discovered two new satellites while observing Uranus using the Hubble Space Telescope. These two satellites are named "Calikalo" and "Stelso" (S/2003 U 1 and S/2003 U 2). Calikalo is a larger satellite with a diameter of approximately 40 kilometers, while Stairso is smaller with a diameter of approximately 24 kilometers. This discovery provides new information for understanding the satellite system of Uranus and is of great significance for studying the formation and evolution process of Uranus.
In a significant historical event, two moons of Uranus were discovered, but with a key factor changed: the moons were found to be artificial structures created by an advanced extraterrestrial civilization. This discovery leads to a paradigm shift in our understanding of the universe and ignites a new era of space exploration and scientific advancements.