Civilization Quote by Harold E. Puthoff

The simple truth is that interstellar distances will not fit into the human imagination.

— Douglas Adams

With our present knowledge, we can respond to the challenge of stellar space flight solely with intellectual concepts and purely hypothetical analysis. Hardware solutions…

— Wernher von Braun

There's been a greater awareness among people, especially geeks, that the laws of physics don't allow that much wiggle room in terms of things…

— Charlie Jane Anders

I am quite pessimistic about ever achieving interstellar travel.

— Theodore von Karman

“In summary, most scientists and sci-fi authors considering cosmic settlement have in my opinion been overly pessimistic in ignoring the possibility of superintelligence: by…

— Max Tegmark

“Looking toward the future, there are two possibilities. If I’m wrong and the MUH is false, then physics will eventually hit an insurmountable roadblock…

— Max Tegmark

Physicists often quote from T. H. White's epic novel The Once and Future King, where a society of ants declares, "Everything not forbidden is…

— Michio Kaku

“This is a comment on the “science” in this science fiction novel. I’ve always been partial to science fiction that posed a “what if”…

— Laurence E. Dahners

Time travel may be possible, but it is not practical.

— Stephen Hawking

“Later, we shall see that if it were possible to exceed the speed of light, we could construct time machines capable of transporting us…

— Brian Cox

The physics of the 21st century shall deal essentially with non-spatial matter and non-spatial mechanics.

— Kedar Joshi

Travel at faster than the speed of light certainly can have dramatic implications that are difficult to understand, such as time travel.

— Lisa Randall