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Absence of evidence is not evidence of absence.

— Martin Rees

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Notes from Wikiquote

-->; this has frequently misattributed to Carl Sagan, who quoted it in some of his presentations.

More quotes by Martin Rees

No one can say which approach is the right one — so no one can say how close we are to a solution.

We live at what could be a defining moment for the cosmos, not just for our Earth.

Our Final Hour: A Scientist's Warning (2003)

When I discover I'm wrong, I change my mind. What do you do?

In future, children won't perceive the stars as mere twinkling points of light: they'll learn that each is a 'Sun', orbited by planets fully as interesting as those in our Solar system.

Once the threshold is crossed when there is a self-sustaining level of life in space, then life's long-range future will be secure irrespective of any of the risks on Earth (with the single exception of the catastrophic destruction of space itself).

Our Final Hour: A Scientist's Warning (2003)

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Attribution

Quote text and notes from Wikiquote: Martin Rees (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.