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LM Lawrence M. Krauss Lawrence M. Krauss Theoretical physicist and author whose research spans elementary particle physics and cosmology, with a public focus on science, reason and free speech.

“Now, I didn't believe it for a second, because I was sure the observations were wrong. Because it's crazy that empty space has energy. It means if you take a part of space and you get rid of all the matter and all the radiation, anything, it weighs something. And that's absurd… And I was more shocked than anyone else that our prediction was correct.”

The Origins Podcast with Lawrence Krauss · Ideas & Essays · November 2026

“Now, I didn't believe it for a second, because I was sure the observations were wrong. Because it's crazy that empty space has energy. It means if you take a part of space and you get rid of all the matter and all the radiation, anything, it weighs something. And that's absurd… And I was more shocked than anyone else that our prediction was correct.” — Lawrence M. Krauss, The Origins Podcast with Lawrence Krauss

Context

Krauss is describing the 1995 paper he co-wrote arguing that most of the universe's energy must sit in empty space. He says he expected the data to turn out wrong, until supernova measurements in 1998 showed the universe's expansion is speeding up.

Transcript

The Origins Podcast with Lawrence Krauss Around 00:00 into the episode
Lawrence M. Krauss

…of that mathematical form, and it's nothing. If you put energy in empty space, and only if you put energy in empty space, will you produce a term like this? But if you put enough energy in empty space, then you could explain a flat universe. And we argued that if you put 70% of the energy of a flat universe in empty space and 30% in matter, that it would agree with observations. And only that. Now, I didn't believe it for a second, because I was sure the observations were wrong. Because it's crazy that empty space has energy. It means if you take a part of space and you get rid of all the matter and all the radiation, anything, it weighs something. And that's absurd. So when we wrote this paper, my point was that the observations must be wrong. But it has a consequence, because remember, it produces, if you put energy here, it doesn't suck, it blows. You put energy in empty space, it's repulsive. And if you think about the expansion of the universe, so 70% is what we argued. And if you look at the expansion of the universe, this is what Hubble measured…

Speaker 2

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Lawrence M. Krauss

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