'We don't need to go into space to do these experiments anymore.'
Now, physicists led by John Koulakis of the University of California, Los Angeles, have circumvented Earth's gravity by creating a radial force analogous to gravity inside the sun, using sound waves.
"Sound fields act like gravity, at least when it comes to driving convection in gas," said Koulakis in aKoulakis' team filled a rotating glass sphere 1.2 inches across with a plasma of sulfur atoms. Microwaves were then employed to heat the plasma to 5,000 degrees Fahrenheit and generate spherically symmetric acoustic waves that exerted a radial force on the plasma analogous to the gravity on the sun, with the strongest"gravity" at the center of the sphere.
"With the use of microwave-generated sound in a spherical flask of hot plasma, we achieved a 'gravity field' that is 1,000 times stronger than Earth's gravity," said Koulakis.
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