Juno NASA's robotic spacecraft entered Jupiter orbit on July 4,2016 holds the record for fastest spacecraft, the gas giant's impressive gravity accelerated the probe to approximately 165,000 mph (265,000 km/h) relative to Earth. Juno the fastest-moving human-made object so far.
NASA's previous Helios I and Helios II probes previously held the record at 157,000 mph (253,000 km/h) as they passed by the sun. These probes were launched in 1974 and 1976, to study solar processes.
The New Horizons probe for fastest launch velocity, which was launched in 2006 on a mission to Pluto and the Kuiper Belt. This piano-size spacecraft sped away from the Earth at a blistering pace of 36,000 mph (almost 58,000 km/h).
Another mission to the sun the Solar Probe Plus scheduled to be launched in 2018, is designed to fly into the sun's atmosphere,. Due to Sun's huge gravity the probe is expected to reach orbital velocities as high as 450,000 mph (724,000 km/h).At this speed, you could travel from the Earth to the moon in about 30 minutes.
The speed of a spacecraft depends on the combination of its own engine, the rocket launcher, and the gravitational pulls of Earth and the planet or star to be explored.
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