International
NASA records mysterious sounds on Mars─── 07:16 Wed, 02 Oct 2019
More sounds from Mars have been revealed and, while some are likely to be marsquakes, the others are a mystery.
NASA's InSight lander arrived on the red planet last November and recorded its first seismic rumbling in April, described by NASA as "quiet but distinct shaking".
The audio samples released on Tuesday cover more than 100 events detected by InSight's seismometer.
Only 21 were likely to have been marsquakes.
Among the other sounds were the Martian wind, mechanical movements by the seismometer's arm and other noises described by the NASA team as "dinks and donks".
The "dinks and donks" are thought to be parts of the seismometer expanding and contracting and the ticking sound could be due to heat loss - similar to the sound a car engine makes after it is turned off and begins cooling.
