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'Phoenix'- An Innovative "lighter than air" aircraft is up for its first test flight

'Phoenix' an innovative aircraft that turns into a 'lighter than air' balloon to propel itself forward was flown for the 1st time. It is designed to repeatedly switch between being lighter & heavier than air to generate thrust & allows it to stay in the sky indefinitely. It's developed by scientists in Scotland, officially called as 'ultra-long endurance autonomous aircraft' that is 15m long & flown over a distance of 120m