NASA spacecraft on journey to Jupiter hits halfway point

"NASA's Juno spacecraft is halfway to Jupiter. The
Jovian-system-bound spacecraft reached the milestone
today (8/12/13) at 5:25 a.m. PDT (8:25 a.m.
EDT/12:25 UTC).

"Juno's odometer just clicked over to 9.464
astronomical units," said Juno Principal Investigator
Scott Bolton, of the Southwest Research Institute in
San Antonio. "The team is looking forward, preparing
for the day we enter orbit around the most massive
planet in our solar system.""

See:

http://www.spacedaily.com/reports/NA...point_999.html


Interesting that a solar-powered spacecraft is being
sent as far out as Jupiter.

How far out can a probe be sent before solar becomes
impractical, and an RTG (Radioisotope Thermoelectric
Generator) becomes necessary?