Science: US develops drone that can stay in sky for 48 hours

Scientists in the US claimed to have developed a new 'silent drone'
that has an increased flight time of about 48 hours, an invention
which is expected to further strengthen the country's surveillance.

The Stalker Unmanned Aerial System (UAS), developed by aerospace
company Lockheed Martin, has been kept in the air for 48 hours using a
radical new laser power system during trials.

This increase in flight time represents an improvement of 2,400 per
cent and could eventually keep military spy drones in the sky forever,
the developers said. The small, silent UAS is already used by Special
Operations Forces since 2006 to perform intelligence, surveillance and
reconnaissance missions.

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