Many galaxies make stars, but this one is a massive star factory. Galaxies with high star formation rates like these are called starburst galaxies. NGC 3310 has hundreds of star clusters — each of them triggers the formation of around a million stars. They come in all shapes, sizes, and especially colors!
Looking at the colors helps researchers learn the age of ca star. Star clusters with lower stellar temperatures glow in red, which means that they have been around quite a while — at least several millions of years. Younger stars are blue since they have higher surface temperatures and are still full of fuel. NGC 3310 has many of these red and blue clusters with ages ranging from one million to more than a hundred million years.
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