A rare chemical that helped DNA form may have come to Earth on comets from newborn stars, astronomers find

· Phosphorus is key in forming DNA and giving rise to life on Earth, but the element is rare in the universe.
· Scientists don't know how Earth got its phosphorus, but scientists just found phosphorus-carrying molecules forming around newborn stars. 
· Researchers found the same molecules on a comet orbiting Jupiter.
· A...