The Ingredients For Planets Turned Up Astonishingly Early
Planet building was supposed to be one of the universe's slow projects, something that only got going billions of years after the Big Bang. New research suggests otherwise. The raw materials for rocky worlds, and perhaps even the water needed for life, may have been ready to go just 100 million years after the Big Bang, long before the first galaxies had even taken shape.
A recent study from the University of Portsmouth has challenged the long-held belief that planet formation only began in earnest once galaxies had formed. Researchers have found evidence that the necessary ingredients for planets were created by the very first stars and dispersed into space long before the Milky Way existed. These initial stars, called Population III stars, were massive and ended their lives in cataclysmic pair instability supernovae.
These explosions ejected heavy elements like carbon, oxygen, and iron into the cosmos, acting as the Universe's first delivery of raw materials. Computer simulations showed that this debris enriched nearby gas clouds, which then collapsed to form discs around newly formed stars. One simulation even revealed a disc around a star 70% as massive as the Sun, containing several Earth masses of solid material and a significant amount of water, much like Earth's own.
While the possibility of habitable worlds forming earlier in the universe's history remains to be seen, this research suggests that the building blocks for planets were in place almost from the very beginning.
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