Fastest-Ever Spacecraft to Arrive at Jupiter Tonight

NASA's Juno probe will attempt to slip into orbit around Jupiter tonight (July 4), shortly after becoming the fastest object ever made by human hands. As Juno nears Jupiter tonight, the giant planet's powerful gravity will accelerate the spacecraft to an estimated top speed of about 165,000 mph (265,000 km/h) relative to Earth, mission team members said. "I don't think we've had any human[-made] object that's moved that fast, that's left the Earth," Juno principal investigato