An artist's rendition of a feeding black hole - known as a quasar -similar to APM 08279+5255, the site for the largest and most distant resivoir of water observed to date.

Photo by: NASA/ESA

Farthest from Home

Drinkability: Low. The largest and most distant source of water in the universe was discovered in 2011. To get to this point, we brought 1000 times the amount of water found in all of Earth’s oceans....
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Water Masers

Drinkability: Low.   What is a maser? Well, it’s just like a laser, but with an “m”. Really, though. M.A.S.E.R. stands for Microwave Amplification by Stimulated Emission of Radiation. It...
An artist's rendition of the TRAPPIST 1 system. The four inner exoplanets all lie in the habitable zone, with three potentially hosting liquid water.

Photo by: NASA, JPL

Exoplanets

Drinkability: High Or so we hope. Planets around other stars in our Milky Way are known as exoplanets and are as exciting and diverse as our fellow humans. From Jupiter-sized planets so close to their host...
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Mars

Drinkability: Medium.   As early as the 1600s, observers suspected that the white blotches that cover Mars’ poles and the wispy patches which drift across its surface were signs of water. Those...
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Earth

Drinkability: Highest.   There are two main theories as to how water first appeared on Earth.       The first posits that Earth’s water didn’t start here, but...
Supernova remnant Cassiopeia A. When stars of sufficient size die, they explode, blowing out the elements they have created, including hydrogen and oxygen. The constituents of water.

Photo courtesy of: NASA

The First Step

Drinkability: Lowest.   Water is composed from two hydrogen and one oxygen molecule (hence the chemical and colloquial name, H2O). Some of these constituent components are as old as the universe...