NASA’s new image of the stars that shouldn’t exist

National Geographic / NASA

Beautiful, isn’t it? But I think it also looks a bit weird compared to most galaxies. Lots of scientists think it’s strange too, although not just because of what it looks like.

Until now it was thought that the majority of stars always form in the centers of galaxies, because that’s where most of the star-forming material is. Also, there are lots of triggers for star formation in the center of a galaxy, like shock waves that come after stars explode and die that can trigger material to start reacting, and thus form new stars.

But as often happens in science, this new photo shows that maybe scientists were wrong about where stars form after all. The The Sombrero Galaxynew photo shows a huge number newborn stars in the outer red spiral arms of the galaxy – something unexpected, because the spiral arms are quite sparse compared to the galactic center 140,000 light years away.

We have known for a long time that stars can form in the spiral arms of a galaxy, but to find so many young stars in such a relatively empty empty area of space is puzzling astronomers. This new galaxy could revolutionize our understanding about how and where stars form.

It’s just one of those things about science – whenever you think you understand something, something crops up that means you have to start over. But hey, that’s how we make progress!

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