Deuterium in Comets Tells Interesting Tales
Comets were long viewed as omens by ancient cultures, but modern astronomy has revealed them to be icy, rocky bodies that release dust and gas as they travel through the inner Solar System.
By Carolyn Collins Petersen
https://www.universetoday.com/articles/deuterium-in-comets-tell-interesting-tales
Books about Comets at PG: https://www.gutenberg.org/ebooks/subject/1827
Comets have play an interesting role in astronomy history. From antiquity, many cultures saw them omens or spirits, portending good or bad news for kings, queens, and emperors. Over the past few hundred years, however, astronomers have studied them intently to understand the science behind these visitors to the inner Solar System. Today we know that these ghostly apparitions in the sky are made of dirty balls of ice and rock blasting through space, scattering dust and gases as they go.
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