Researchers think a mysterious signal, dubbed GW190521, could have arrived from a parallel universe after passing through a ...

Some things we see in space appear to outpace light. Now we are learning to harness these bizarre optical illusions to ...

Cold atoms could also potentially measure much lower vacuum pressures than ion gauges can. The current lowest pressure they’ve reliably measured is around 10 -9 Pa, and NIST scientists are working on ...