Stephen Hawking

The event horizon is a boundary beyond which events cannot affect an outside observer.

From A Brief History of Time

The past, present, and future are all interconnected.

From A Brief History of Time

We are just an advanced breed of monkeys on a minor planet of a very average star.

From A Brief History of Time

Intelligence is the ability to adapt to change.

From A Brief History of Time

Our universe is one of many.

From A Brief History of Time

The universe doesn't allow perfection.

From A Brief History of Time

The laws of science must hold everywhere.

From A Brief History of Time

A black hole is a region of space where the gravitational pull is so strong that nothing can escape.

From A Brief History of Time

Time and space are intertwined.

From A Brief History of Time

If we find the answer, it would be the ultimate triumph.

From A Brief History of Time