Over 20,000 miles above the Earth’s surface, hundreds of satellites can be found orbiting our planet. Using transponders, they are able to send messages via radio frequencies, providing us with many of the modern comforts we enjoy today.

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Ever since 1988, satellites have been detecting radio signals from outer space, which could be coming from as far away as 15,000 light years.

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As the Earth’s only natural satellite, the moon takes 27.3 days to complete its orbit and 29.5 days to complete its waxing and waning cycle.

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