NASAのインスタグラム(nasa) - 8月27日 03時49分

Irregular Island in a Sea of Space: This image, courtesy of the Hubble Space Telescope, captures the glow of distant stars within a dwarf galaxy located just over 15 million light-years away in the constellation of Hydra (The Sea Serpent). Dwarf galaxies like this typically possess around a billion stars - just 1 percent of the number of stars found within the Milky Way. They are usually found orbiting other larger galaxies such as our own, and are thought to form from the material left over from the messy formation of their larger cosmic relatives. This galaxy clearly possesses an irregular shape - unlike the more common spiral or elliptical galaxies - with knots of blue star formation. Astronomers believe that this is due to the gravitational interactions between it and other galaxies nearby. These past flirtations sparked the formation of new generations of stars, which now glow in bright shades of blue.

Image credit: ESA/Hubble & NASA

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