Description : What is the top speed for a space probe now and in the future?
Last Answer : answer:Currently Helios 2 is the fastest spacecraft ever built-the Helios 2 probe, launched in 1976 to monitor the sun-attained a top speed of 157,000 miles an hour. At that rate, a spacecraft ... from National Geograhic's web article. Future sky is the limit maybe approaching the speed of light.