Browse Quotes

1,161 quotes

It is necessary to speak and to think what is truly being; for being is, but nothing is not.

Parmenides

Philosophy

No man ever steps in the same river twice, for it's not the same river and he's not the same man.

Heraclitus

Philosophy

As our soul, being air, holds us together, so breath and air encompass the whole world.

Anaximenes of Miletus

Philosophy

The black hole at the center of our galaxy is a fantastic laboratory for understanding how gravity works in the most extreme environment.

Andrea Ghez

Astronomy

Space-time tells matter how to move; matter tells space-time how to curve.

Kip Thorne

Astrophysics

The universe is expanding, and it's doing so at an accelerating rate. This was a complete surprise to us.

Brian Schmidt

Cosmology

The universe is not only stranger than we imagine, it is stranger than we can imagine.

Saul Perlmutter

Cosmology

The universe is not only expanding, but its expansion is accelerating. This was a complete surprise.

Adam Riess

Cosmology

The universe is not only stranger than we imagine, it is stranger than we can imagine.

Wendy Freedman

Astronomy

Space is not a thing, it is a relationship.

Fred Hoyle

Cosmology

The pursuit of science is not a race, but a journey.

Subrahmanyan Chandrasekhar

Astrophysics

The universe is expanding, and this expansion can be traced back to an initial state of extreme density and temperature.

Georges Lemaître

Cosmology

A straight line of dots, representing the relation between the brightness of the variables and their periods, can be drawn.

Henrietta Swan Leavitt

Astronomy

I have found the planet.

Urbain Le Verrier

Astronomy

The stars are not fixed, but are in motion.

Friedrich Bessel

Astronomy

I am nothing, I have nothing, I can do nothing, but I will do my best.

Caroline Herschel

Astronomy

The heavens are a book, where God has written his wonders.

William Herschel

Astronomy

The comet of 1682, which I have observed, and whose elements I have computed, will, I am confident, return again in the year 1758.

Edmond Halley

Astronomy

The heavens are not simple, but composed of spheres, and the motion of each sphere is uniform and circular.

Nasir al-Din al-Tusi

Astronomy

The eye is not a source of light, but rather a receiver of light.

Alhazen

Astronomy