The Juno spacecraft is on its way to Jupiter, getting closer and closer as the years go by. Having left in August of 2011, five years later, Juno is due to arrive in July of this year. It is going to be the first solar-powered spacecraft to reach as far as Jupiter. Its mission is to study the planet, in search of evidence of a solid core, understand its origin, to detect and measure its magnetic field, detect signs of water and ammonia in the atmosphere, and etc.
The distance between Earth and Jupiter is astounding, seeing as it is taking five years for Juno to reach Jupiter. Additionally, since Juno is only supposed to orbit around Jupiter for one year after travelling for so long, it will be really interesting to see what information the probe will gather.