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Acoustic levitation allows small objects, like droplets of liquid, to float. Unless you travel into the vacuum of space, sound is all around you every day. But most of the time, you probably don't think of it as a physical presence. You hear sounds; you don't touch them. The only exceptions may be loud nightclubs, cars with window-rattling speakers and ultrasound machines that pulverize kidney stones. But even then, you most likely don't think of what you feel as sound itself, but as the vibrations that sound creates in other objects. The idea that something so intangible can lift objects can seem unbelievable, but it's a real phenomenon. Acoustic levitation takes advantage of the properties of sound to cause solids, liquids and heavy gases to float. The process can take place in normal or reduced gravity. In other words, sound can levitate objects on Earth or in gas-filled enclosures in space.|Illustration of the neutron star collision that created the signal GW170817 NASA/CXC/Trinity University/D. When two neutron stars collide and merge, what do you get? A beefier neutron star or a tiny black hole? A May 2018 paper looking into last year's historic neutron star collision suggests the latter. On Aug. 17, 2017, the U.S.-based Laser Interferometer Gravitational-wave Observatory (LIGO) and Italian Virgo gravitational wave observatory detected what is arguably the most significant astronomical event in modern times: a neutron star smashup. That smashup created a gravitational wave signal named GW170817. Unlike the handful of gravitational wave signals that came before it, GW170817 wasn't generated by a merging black hole. Then, at roughly the same time, NASA's Fermi space telescope detected a short gamma-ray burst (GRB) in that patch of sky. Scientists had theorized that such bursts were triggered by two neutron stars colliding, and through the analysis of GW170817, they confirmed the neutron star merger scenario. Astronomers made many scientific discoveries in the wake of this astronomical event, but GW170817 just keeps on giving.




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