The US space agency NASA has presented its new supersonic aircraft X-59 to the public for the first time. The jet, which is around 30 metres long and pointed at the front with a wingspan of around 10 metres, was unveiled on Friday at a site belonging to defence contractor Lockheed Martin in the US state of California. NASA streamed live images of the unveiling over the internet. The aircraft is the centrepiece of NASA’s “Quesst” (Quiet SuperSonic Technology) mission. The first flight tests over selected regions of the US are planned for later this year, during which further data will be collec…