The International Space Station (ISS), in Earth orbit at hundreds of kilometers altitude, is not perfectly airtight. Every day, the cabin loses a minute how much air, carefully controlled so that a viable atmospheric pressure can be maintained, and to identify leaks. Now the last one just happened, just two …
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The existence of time crystals – a particularly fascinating state of matter – was confirmed only a few short years ago, but physicists have already made a pretty big breakthrough: they have induced an interaction and observed between two time crystals. In a superfluid helium-3, crystals exchange quasi-particles twice without …
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Black holes don’t shine; in fact, they are famous for doing the opposite. But if they are actively devouring material from the space around them, that material can burn like a trillion X-ray suns. And for the first time, astronomers have now seen that mysteriously extinguished fire, before gradually returning …
Read More »[ad_1] By Julie Appleby, Kaiser Health News As many states begin to reopen – most without meeting the thresholds recommended by the White House – a new level of COVID-19 risk analysis begins for Americans. Should I go to the beach? What about the hair salon? A sit-down restaurant meal? …
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