Scientists now say as much as 30 percent of the Earth’s water comes from outer space, and since humans are made of 60 percent water, that means we’ve all got a little bit of alien stuff in us.
A new study published in the academic journal Science claims that between 10-30 percent of the Earth’s water is older than the sun, and likely originated from outside our solar system as frozen, alien ice. So, yeah, that bottle of Dasani in the fridge could be a tad extraterrestrial. Cool.
Some of the water on Earth was formed in the hot solar nebula, but the study posits that a solid percentage of it probably came from beyond our little corner of the Milky Way. The paper used computer models developed by study author L. Ilsedore Cleeves at the University of Michigan to reach the 10-30 percent estimate for extraterrestrial water.
Even more interesting? The study takes things a step further to propose that if water entered our solar system from interstellar space, the same thing could also have happened on planets in other part of the galaxy — meaning improved odds that water, and potentially life, exists on more alien worlds than we’d first thought. Carnegie Institution of Washington geochemist Conel Alexander told Newseek the finding “probably means that most solar systems look similar to us [in terms of chemical makeup], and we know that life started in this solar system.”
So, while we look to the stars in amazement this week as everyone seems to be poking around Mars, we can take a little solace in the fact that we might have a little bit of space stuff inside us all.