Christiaan Huygens

We shall make no scruple to allow, that the soul is corporeal.

The cause of gravity, I confess, I do not yet understand.

All matter is composed of very small particles, or atoms.

The laws of mechanics are the foundation of all physical science.

Time is to be measured by a pendulum moving with equal swings.

I have found a way to make clocks so accurate that they can serve to determine longitude at sea.

The center of oscillation and the center of suspension are interchangeable.

Nothing is more prolific in utility than the abstract sciences.

The universe is visible everywhere, and the same laws of nature prevail throughout.

It is not impossible that there are inhabitants on the other planets.

What a wonderful and amazing scheme have we here of the magnificent vastness of the universe!

The light of the sun takes about eleven minutes to reach us.

I had to overcome tremendous difficulties in grinding lenses of such a long focal length.

The discovery of the ring of Saturn was the result of improved instruments.

The motion of the waves is such that the parts of the medium do not advance, but merely oscillate.

Each particle of matter not only transmits its motion to the next, but also partly returns it.

The extraordinary rays are produced when light passes through certain crystals.

We see that the theory agrees with observation.

It seems that to this day, the true philosophy has been followed by very few.

The force which keeps the planets in their orbits must be inversely as the square of their distances from the centers about which they revolve.