RadioAstron
project is an international collaborative mission to launch a free flying satellite carrying a 10-meter radio telescope in elliptical orbit around the Earth. The aim of the mission is to use the space telescope to conduct observations
with the extraordinary high angular resolution.

The orbit of RadioAstron satellite will have apogee radius in the range up to 350,000 km. Space ground VLBI measurements with this orbit will provide information on galactic and extragalactic radio sources with fringe size up to 8 micro arc second. Which is about the size of a pea on the surface of the Moon as seen from Earth.