Google could use the drones for a variety of projects, like taking photos for Google Maps and Google Earth, and for Project Loon, its initiative to send balloons into the atmosphere to beam Internet to parts of the world that are not yet connected.
There were reports earlier this year that Facebook wanted to buy Titan Aerospace for $US60 million.
So what do we know about these drones?
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.
Besides the solar panels, the drones also have internal battery banks as back up so they can launch at night.
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 72 lbs. That means Google could load it up with equipment to beam the Internet to people on the ground.
The drones can cruise at speeds up to 104 kph, or 64 mph.
They have a mission range of 4 million km, meaning that they can travel about 2.5 million miles.
These drones are the world’s first atmospheric satellites powered by the sun.
They are cheaper than orbital satellites, but have the same capabilities, like weather monitoring and earth imaging (or providing Internet access to parts of the world with no infrastructure).
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