A stars rich in europium; of distant galaxies analyzed through the collective light of a hundred billion constituent stars. Astronomical spectroscopy is an almost magical technique. It amazes me still. Auguste Comte picked a particularly unfortunate example.

— Carl Sagan

Carl Sagan Quotes

We are like butterflies who flutter for a day and think it is forever.

— Carl Sagan
Life Deep About Life Famous Meaningful

We are a way for the cosmos to know itself.

— Carl Sagan
Deep About Life Interesting Short Inspiring Science

I promise to question everything my leaders tell me. I promise to use my critical faculties. I promise to develop my independence of thought. I promise to educate myself so I can make my own judgments.

— Carl Sagan
Lifelong Learning About Thinking Inspirational for Students Doubt

Not all bits have equal value.

— Carl Sagan

The politicians and the religious leaders and the weapons scientists have been at it for a long time and they’ve made a thorough mess of it. I mean, we’re in deep trouble.

— Carl Sagan

When permitted to listen to alternative opinions and engage in substantive debate, people have been known to change their minds. It can happen.

— Carl Sagan

There is in this Universe much of what seems to be design.

— Carl Sagan

The candle flame gutters. Its little pool of light trembles. Darkness gathers. The demons begin to stir.

— Carl Sagan

Human history can be viewed as a slowly dawning awareness that we are members of a larger group.

— Carl Sagan

Where did God come from? If we decide this is an unanswerable question why not save a step and conclude that the origin of the universe is an unanswerable question.

— Carl Sagan

By looking far out into space we are also looking far back into time, back toward the horizon of the universe, back toward the epoch of the Big Bang.

— Carl Sagan

Perhaps the depth of love can be calibrated by the number of different selves that are actively involved in a given relationship.

— Carl Sagan

In exchange for freedom of inquiry, scientists are obliged to explain their work.

— Carl Sagan

If we ruin the earth, there is no place else to go.

— Carl Sagan

Every thinking person fears nuclear war, and every technological state plans for it. Everyone knows it is madness, and every nation has an excuse.

— Carl Sagan

Nothing disturbs me more than the glorification of stupidity.

— Carl Sagan

The evidence, so far at least and laws of Nature aside, does not require a Designer. Maybe there is one hiding, maddeningly unwilling to be revealed.

— Carl Sagan

We humans look rather different from a tree. Without a doubt we perceive the world differently than a tree does. But down deep, at the molecular heart of life, the trees and we are essentially identical.

— Carl Sagan

But our preferences do not determine what’s true.

— Carl Sagan

One of the great commandments of science is: ‘Mistrust arguments from authority.’

— Carl Sagan
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