A pale blue dot may not be the only hint of life beyond the solar system. New research suggests astronomers pay attention to pale orange worlds as well, since they may resemble what Earth looked like earlier in its history.
A series of laboratory tests show that some terrestrial bacteria would adapt well to the salty and sulfate-rich ocean believed to exist beneath the hard icy shell of Europa.
The fascinating speculation surrounding a recent Kepler observation of a star 1,500 light-years away has reignited questions of alien life in our universe and what it means for future studies.
It's a virtual certainty that comets have delivered the building blocks of life to Europa's hidden ocean, according to a new study.
As astronomical techniques become more advanced, a team of astrophysicists think they will be able to not only detect the signatures of alien life in exoplanetary atmospheres, but also track its relentless spread throughout the galaxy.
Cassini has once again turned to Enceladus, the enigmatic moon of Saturn.
Outer space might be the toughest environment for life, but some hardy microbes have been able to survive in it for surprising amounts of time.
Chemical engineers have created a theoretical model of a type of alien cell that might be able to support life on Titan.
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