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Galaxies are fundamental building blocks of the Universe. Some are simple, while others are very complex in structure; some have enormous sizes and contain trillions of stars, while others are very small and contain only hundreds of thousands of stars; some are yellowish and other display a variety of colours, from red to blue. As we live in one galaxy, the Milky Way, it is interesting to know the different galaxy compositions and the analogies and differences with other galaxies.


Explore in ESAsky and classify the galaxies you observe. You will learn about the structure of galaxies and how to extract information from astronomical images.
Keywords: Galaxies, ESAsky.