... Observing . ... Star Atlas . ... stars . ... Hubble watches star clusters on a collision course . ... This is a Hubble Space Telescope image of a pair of star clusters that are believed to be in the early stages of merging. ... What at first was thought to be only one cluster in the core of the massive star-forming region 30 Doradus т?? also known as the Tarantula Nebula т?? has been found to be a composite of two clusters that differ in age by about 1 million years. ... Atlas of the Stars . ...