Most of Earth's life-essential elements probably arrived with the planetary collision that produced the moon. Petrologists now conclude Earth most likely received the bulk of its carbon, nitrogen and other life-essential volatile elements from a collision with a Mars-sized planet more than 4.4 billion years ago.
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/01/190123144519.htm
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/01/190123144519.htm
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