Well we have built the ISS, sent multiple unmanned rovers to Mars and Probes that are now on they way out of the solar system. A picture taken from Voyager 1 in 1990. Earth from 3.7 billion miles away. It's at a distance of about 125.12 AU (1.872×1010 km) as of 14 August 2013. One Au (Astronomical Unit) is 149,597,870,700 km (92,955,807.3 mi), or roughly the average Earth–Sun distance. (The distance from Earth to the Sun)