Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

Humans are captivated by the idea of finding life elsewhere in the universe – and even more by the idea that life, if found, might resemble the complex, animal life here on Earth. One of the easiest ...

Some animals living on Earth appear so unusual that they are often compared to aliens. Their shapes, movements, and behaviors challenge common ideas of what life should look like. Scientists explain ...

In a blow to anyone dreaming that complex life may exist elsewhere in the universe, a new study suggests we're unlikely to ...