“A new study published today (Sept. 25) in the journal Science suggests that between 10 to 30 percent of the Earth’s water is older than the sun, and likely hails from comets born outside our solar system. That means that the human body, which is 60 percent water, contains a significant percentage of extraterrestrial aqua; in that sense, we are all part alien.” – Douglas Main, Newsweek
And if it’s true of us, it’s probably true of others. Life elsewhere may take similar forms because water may form its basis, as it does ours.
Much of Earth’s Water Is Older Than the Sun, and Came From Deep Space – Newsweek
Up to Half of Earth’s Water Is Older Than the Sun – New Scientist
Half of Earth’s Water Formed Before the Sun Was Born – Science
Water Found in Stardust Could Mean a Universe Seeded With Life