Four baby planets show how super-Earths and sub-Neptunes form

Thanks to the discovery of thousands of exoplanets to date, we know that planets bigger than Earth but smaller than Neptune ...

Earth's early sponges were soft: Scientists close fossil record gap

Sponges are among Earth's most ancient animals, but exactly when they evolved has long puzzled scientists. Genetic information from living sponges, as well as chemical signals from ancient rocks, ...
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Super-low density worlds reveal how common planetary systems form

Most planetary systems contain worlds larger than Earth but smaller than Neptune, and the low-density planets around one ...