NASA's InSight lander 'hears' strange sounds on Mars

Entertainment Magazine's News Desk || IANS || October 2, 2019\n\nNASA has released recordings of eerie sounds on Mars picked up by one of its missions to the Red Planet, the InSight lander.\n\nFar below the human range of hearing, these recordings had to be speeded up and slightly processed to be audible through headphones, NASA said on Tuesday.\n\nThe spacecraft's exquisitely sensitive seismometer, called the Seismic Experiment for Interior Structure (SEIS), can pick up vibrations as subtle as a breeze.\n\nThe instrument was provided by the French space agency, Centre National d'Etudes Spatiales (CNES), and its partners.\n\nThe instrument was designed to listen for quakes on Mars, known as marsquakes.\n\nScientists want to study how the seismic waves of these quakes move through the planet's interior, revealing the deep inner structure of Mars for the first time.\n\nBut after the seismometer was set down by InSight's robotic arm, Mars seemed shy. It did not produce its first rumbling until this past April, and this first quake turned out to be an odd duck.\n\nIt had a surprisingly high-frequency seismic signal compared to what the science team has heard since then.\n\nOut of more than 100 events detected to date, about 21 are strongly considered to be quakes, NASA said.\n\nThe remainder could be quakes as well, but the science team hasn't ruled out other causes.\n\nSEIS has no trouble identifying quiet quakes, but its sensitive ear means scientists have lots of other noises to filter out.