If there were extraterrestrials out there, NASA wanted them to know about life on this planet. Today is the fortieth anniversary of the first Voyager's departure. read more
I would describe human beings in ecological terms, since any aliens would be familiar with ecology from the biosphere of their homeworld. While all the details would be different, the overall structure of a mature biosphere, and the ecological and evolutionary principles by which life develops, are likely to be highly consistent across worlds. read more