We are made of star-stuff. Our bodies are made of star-stuff. There are pieces of star within us all.
The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function.
By far the best proof is experience.
God is dead, God remains dead, and we have killed him.
Science may have found a cure for most evils; but it has found no remedy for the worst of them all – the apathy of human beings.
Two things awe me most, the starry sky above me and the moral law within me.
Two things fill the mind with ever new and increasing admiration and awe, the oftener and more steadily we reflect on them: the starry heavens above and the moral law within.
There is an art to science, and a science in art; the two are not enemies, but different aspects of the whole.
Today’s science fiction is tomorrow’s science fact.
Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion.
A body in motion tends to stay in motion unless acted on by an outside force.
An object that is at rest will tend to stay at rest. An object that is in motion will tend to stay in motion.
One thing in life is for certain, the more profoundly baffled you have been in your life, the more open your mind becomes to new ideas.
If you want to assert a truth, first make sure it’s not just an opinion that you desperately want to be true.
Space exploration is a force of nature unto itself that no other force in society can rival.
Follow the evidence wherever it leads, and question everything.
The day we stop exploring is the day we commit ourselves to live in a stagnant world, devoid of curiosity, empty of dreams.
If you’re scientifically literate, the world looks very different to you, and that understanding empowers you.
Claiming there is no other life in the universe is like scooping up some water, looking at the cup and claiming there are no whales in the ocean.
My view is that if your philosophy is not unsettled daily then you are blind to all the universe has to offer.