Astronomy Quote by Carl Sagan

Extraordinary claims require extraordinary evidence.

— Carl Sagan

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

Extraordinary observations require extraordinary evidence.

— Buzz Aldrin

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

— Carl Sagan

Extraordinary allegations require extraordinary evidence.

— Lance Armstrong

I believe in evidence. I believe in observation, measurement, and reasoning, confirmed by independent observers. I'll believe anything, no matter how wild and ridiculous,…

— Isaac Asimov

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

We are firm believers of the paranormal, but we believe over 80 percent of all claims can be disproved.

— Jason Hawes

“extraordinary claims require extraordinary investigation”

— Anonymous

“a skeptic's mantra is "extraordinary beliefs require extraordinary evidence.”

— Anonymous

Exceptional claims, require exceptional evidence.

— Christopher Hitchens