Evidence Quote by Carl Sagan

Extraordinary claims demand extraordinary evidence

— Carl Sagan

“extraordinary claims require extraordinary investigation”

— Anonymous

Extraordinary allegations require extraordinary evidence.

— Lance Armstrong

Exceptional claims, require exceptional evidence.

— Christopher Hitchens

Extraordinary claim requires extraordinary proof.

— Carl Sagan

I believe that the extraordinary should be pursued. But extraordinary claims require extraordinary evidence.

— Carl Sagan

Extraordinary observations require extraordinary evidence.

— Buzz Aldrin

Extraordinary observations require extraordinary evidence to make them believable.

— Carl Sagan

The weight of evidence for an extraordinary claim must be proportioned to its strangeness.

— Pierre-Simon Laplace

“An extraordinary claim requires extraordinary proof. ('On the Extraordinary: An Attempt at Clarification", Zetetic Scholar, Vol. 1, No. 1, p. 11, 1978)”

— Marcello Truzzi

For years I've been stressing with regard to UFOs that extraordinary claims require extraordinary evidence.

— Carl Sagan

Extraordinary claims require extraordinary evidence, and it is my job, my responsibility, as an astronomer to remind people that alien hypotheses should always be…

— Tabetha S. Boyajian