Habitable Worlds Could Have Formed Before the First Galaxies

This artist’s impression shows the planet K2-18b, it’s host star and an accompanying planet in this system. K2-18b is now the only super-Earth exoplanet known to host both water and temperatures that could support life. Could habitable worlds like this have formed before galaxies formed? Image Credit: ESA/Hubble, M. Kornmesser

What came first, galaxies or planets? The answer has always been galaxies, but new research is changing that idea.

Could habitable planets really have formed before there were galaxies?

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