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It's similar to Google's plan to use balloons to beam Internet access to countries that don't have the infrastructure for broadband Internet. And it behooves both companies to get as many new people online as possible using their services instead of a potential rival's.
The drones are covered in solar panels, which store enough energy to lift the craft 20 kilometers above sea level. The drones can stay aloft for five years before having to land or refuel.
The smaller model - the Solara 50 - is 50 meters long (picture the length of an Olympic swimming pool) but it weighs only 160 kg (about 353 lbs). It can carry a payload of up to one-fifth its weight: 32 kg or 32 lbs. That means Facebook could load it up with equipment to beam the Internet to people on the ground.
They are cheaper than orbital satellites, but have the same capabilities, like weather monitoring and earth imaging. Or, in Facebook's case, providing Internet access to parts of the world with no infrastructure.