New Horizons is about the size and weight of a grand piano, and is currently screaming along at about 14 kilometers per second.
How fast is 14 kilometers per second? If you were standing at one end of a football field and fired a gun toward the other end, right while New Horizons flew past you, the spacecraft would reach the far end zone before the bullet made it to the 10-yard line. In that same amount of time, a speeding car would travel about an inch.
New Horizons flies too far from the Sun to use solar panels, so it's powered by the heat from a bunch of lumps of plutonium-238. The container holding the plutonium is sturdy, since it's designed to survive atmospheric reentry (and has done so).
Its Launch mass is 478 kilograms.
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