Exobiology is considered a hard science though the subject is highly speculative.

“If real Intelligent aliens are watching us perhaps they are laughing at us (or doing whatever...

Intelligent aliens

Perception

“Also see: Biochemistry Despite its diversity, all life on Earth displays a remarkable similarity...

Alternative biochemistry

“ETI refers to Extra Terrestrial Intelligence. For our purposes, we can consider "Life" to...

ETI Scenario I

Speculative biomechanics

Alien planets

Speculative bioenergetics

Habitable solar systems