On February 25, the NASA New Horizons mission finally reached one of the major milestones of its flight – namely exceeding half the distance to its target, the dwarf planet Pluto. The spacecraft, which is one of the few being propelled by a cylindrical radioisotope thermoelectric generator, or RTG, carries with it 11 kilograms (24 pounds) of plutonium-238 oxide pellets, which will provide the spacecraft with sufficient power until it reaches its destination. This particular probe is the fastest artificial device in the Universe, 16.26 kilometers per second, or 36,373 miles per hour. This will allow it to arrive in the orbit of Pluto by 2015, by the target is so far away that it will take a total of 9 years until it is reached, Space reports.
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