Quotes by Lawrence M. Krauss

“It is a shame when nonsense can substitute for fact with impunity.”

“We only see shadows of reality. We shouldn't expect those shadows to behave sensibly.”

“... we're here because of an environmental accident if there is a multiverse and if the laws of physics are different in the different regions ...”

“Theorists always know the answer. They're just sometimes right.”

“Science is empirical: knowing the answer is nothing. Testing your knowledge means everything.”

“The Universe must be flat. Why? Well, there is two reasons. There's the one I normally say, which is: it's the only mathematically beautiful universe. Which is true, but there's another reason I do...”

“Richard Feynman used to go up to people all the time and he'd say, You won't believe what happened to me today. You won't believe what happened to me. And people would say What? And he'd say, Absol...”

“But what we've discovered is that, in fact... the total energy of the universe could be zero, which is a first clue that maybe it could come from nothing. ...In physics, ...once you include gravity...”

“The energy of every galaxy—all the galaxies are moving away from us at, Hubble discovered that in 1929... If you measure their speed and then you work our the attraction the two add up to precisely...”

“[O]ne of the great things about science is it forces us to refine our idea of what's common sense. It forces us to have our beliefs conform to the evidence of reality rather than the other way arou...”

“Now some people say, Well, if there's virtual particles there it's really not nothing, but there are no real particles. You try and measure things there, there's nothing, but those virtual particle...”

“[W]hen you apply quantum mechanics to gravity, then even space itself can pop into existence from nothing. Space and time can spontaneously pop into existence... Whole universes can pop into existe...”

“[Y]ou... may say, Well look, we've got no space, no time, no particles, no radiation. That's a pretty good approximation of nothing, but there's still the laws. Who created the laws? And... what we...”

“[W]hy presumes purpose... But what if there isn't purpose? Whenever we say why we really mean how.”

“[W]e can weigh systems of galaxies. The largest bound objects in the universe are called clusters of galaxies. They're maybe ten million light years across. ...We weigh them using gravity because E...”

“There's a loophole if you weigh galaxies and clusters because you're weighing the total amount of energy around galaxies. What if there's energy where galaxies aren't? What is where galaxies aren't...”