We only have to look at ourselves to see how intelligent life might develop into something we wouldn't want to meet.
The cyclic universe theory predicts no gravitational waves from the early universe.
Interpretation
What this quote means
The quote suggests that the cyclic universe theory implies the absence of certain cosmic phenomena, specifically gravitational waves, in the early universe.
In this quote, Stephen Hawking discusses a key aspect of the cyclic universe theory, which posits that the universe undergoes endless cycles of expansion and contraction. According to this theory, the conditions in the early universe differ from those predicted by other models, particularly in relation to gravitational waves, indicating that certain physical phenomena may not have occurred during its formative stages.
Themes
In practice
Example use cases
In a lecture on cosmology, you might use this quote to illustrate the differences between various theories of the universe.
More from Stephen Hawking
All quotes βI regard the brain as a computer which will stop working when its components fail. There is no heaven or afterlife for broken down computers; that is a fairy story for people afraid of the dark.
It surprises me how disinterested we are today about things like physics, space, the universe and philosophy of our existence, our purpose, our final destination. Its a crazy world out there. Be curious.
I was not a good student. I did not spend much time at college; I was too busy enjoying myself.
The world has changed far more in the past 100 years than in any other century in history. The reason is not political or economic but technological-technologies that flowed directly from advances in basic science. Clearly, no scientist better represents those advances than Albert Einstein: TIME's Person of the Century.
In my opinion, there is no aspect of reality beyond the reach of the human mind.
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In fast moving fields like cancer, where doctors tailor treatments based on evidence that's constantly evolving, two years can be an eternity of waiting to learn about important science. For some patients, that interval can be fatal.
What, then, is this blue sky, which certainly does exist, and which veils from us the stars during the day?
Universe consists of frozen light.
Part of knowing how to think is knowing how the laws of nature shape the world around us. Without that knowledge, without that capacity to think, you can easily become a victim of people who seek to take advantage of you.
That the fundamental aspects of heredity should have turned out to be so extraordinarily simple supports us in the hope that nature may, after all, be entirely approachable. Her much-advertised inscrutability has once more been found to be an illusion due to our ignorance. This is encouraging, for, if the world in which we live were as complicated as some of our friends would have us believe we might well despair that biology could ever become an exact science.
Part of what it is to be scientifically-literate, it's not simply, 'Do you know what DNA is? Or what the Big Bang is?' That's an aspect of science literacy. The biggest part of it is do you know how to think about information that's presented in front of you.