Northop Grumman put up an article about aliens being potentially invisible to humans.
>Where is everybody? In a universe of at least 100 billion galaxies, why hasn’t anyone stopped by?
>The answer depends on who you ask. Some favor the notion of time and distance — extraterrestrial life may not know we’re out here, or may be similarly limited to their local solar system by the finite speed of light. Others make more dire predictions for the fate of advanced life in the universe: Catastrophic events such as war, disease or stellar bad luck that effectively eliminate evolving life once it reaches a certain threshold.
>But what if the truth lies closer to home? What if invisible aliens exist among us, already here but unseen by human eyes? Astrobiologist Samantha Rolfe of the University of Hertfordshire took this idea and ran with it, exploring the possibility of a “shadow biosphere” capable of supporting alien life on Earth — just not life as we know it.
>Where is everybody? In a universe of at least 100 billion galaxies, why hasn’t anyone stopped by?
>The answer depends on who you ask. Some favor the notion of time and distance — extraterrestrial life may not know we’re out here, or may be similarly limited to their local solar system by the finite speed of light. Others make more dire predictions for the fate of advanced life in the universe: Catastrophic events such as war, disease or stellar bad luck that effectively eliminate evolving life once it reaches a certain threshold.
>But what if the truth lies closer to home? What if invisible aliens exist among us, already here but unseen by human eyes? Astrobiologist Samantha Rolfe of the University of Hertfordshire took this idea and ran with it, exploring the possibility of a “shadow biosphere” capable of supporting alien life on Earth — just not life as we know it.
