Structure in the Cosmos

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© NASA, ESA, and F. Paresce (INAPF-AIASF, Bologna, Italy).

It is a basic tenet of cosmology that the universe is homogeneous and isotropic, which means that it looks basically the same in all directions. However, as this Hubble Space Telescope image (actually a combination of two images taken at different wavelengths) shows, there is a wide variety of small-scale structure in the universe. Here, we see a star-forming region in a satellite galaxy of the Milky Way. This image contains some of the most massive known stars and coalescing gas clouds in a young stellar grouping called "R136." (Unit: 4)