Is our moon hollow?

Credit: CNN
Voyager 1 and Voyager 2 cost $328 million in 1977.
The only deep space telescope capable of sending information to Voyager is in Australia.
Voyager sends information back to earth using 12 watts of power, the same power that fires up the light in your refrigerator.
It is travelling at 16 Kilometres a second and covers more than a million kilometres every day.
Voyager 1 will likely outlive our Sun and the earth, orbiting the milky way galaxy forever.
Voyager 1 is the fastest spacecraft we have ever launched into space.
It has been using an 8 track tape system to record and send back information to the earth for the past 42 years without fail.
It now takes 20 hours for signals from Voyager to reach us, at the speed of light!
Voyager 1 used Jupiter and Saturn to "Slingshot" and increase its speed without using extra fuel.
The Voyagers have a "Golden Record" attached to them, designed to be a calling card in case an alien race intercepted them. It contains music, sounds and images from the Earth.
Voyager is powered by a nuclear battery which will likely run out by 2025.
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