The ●●●●●●r ●●●●●●fen V●●●●●● 1 and a ●●●●●● probe, V●●●●●● 2, were ●●●●●●ed in 1977 to study the outer ●●●●●●s. V●●●●●● 1 is now about 120 times ●●●●●●r away from the sun than Earth. V●●●●●● 2 is ●●●●●●g out of the solar ●●●●●● in a ●●●●●●ent ●●●●●●ion.
