Earth could host alien life with completely different biochemistry, coexisting undetected in niche environments.

A sealed world in the Arizona desert was meant to prove humanity could survive beyond Earth, but what happened inside ...

Language and radio signals may not matter to aliens. Instead, they might be using patterns to leave a biological fingerprint.

Biological invasions are inherently linked to human activities, as the movement of species beyond their native ranges is largely driven by global trade, ...