Star Clusters

A star cluster is a group of related stars usually held together by gravity. Globular clusters are densely packed groups of hundreds of thousands of very old stars. Open clusters are smaller, scattered groups of younger stars. Until recently, astronomers wrestled with a great cosmological mystery: according to theories of stellar evolution, it appeared that some globular clusters were actually older than the universe itself. How was this paradox resolved? Discuss
…read more

CategoriesUncategorized