How big is our galaxy?
If the Solar System, from the Sun all the way out to Pluto, were shrunk to the size of a U.S. quarter, the Milky Way would be the size of North America.

Micro Wave
The radio signal that a spacecraft uses to contact Earth has no more power than a refrigerator light bulb. And by the time the signal has traveled across space, the signal is only one-billionth of one-billionth of one watt!

Big Ears
To detect those tiny signals, the Deep Space Network uses antennas with diameters of up to 70 meters (230 feet). That's almost as big as a football field.