NASA's Juno Spaceship to Jupiter Will Make the Most Distant Use of Solar Power Ever

Inhabitat - Green Design Will Save the World
NASA is prepared to launch a mission to Jupiter this week that will probe deep into the planet’s clouds to reveal what it is made of. The Juno spacecraft will also make history by being the most distant space probe to use solar panels as its primary source of electricity. The decision charts a new course for deep space missions that traditionally used a radioactive battery, and it stands to prove the viability of solar technology even when the sun is 5 times further away than it is from our home planet.(...)[June has] high-tech gallium arsinide solar cells rather than a traditional radioisotope thermoelectric generator that uses decaying Plutonium 238 to create electricity. Three wings of solar panels sprout from the craft, covering 60 square meters. They will produce 15 kW of power at 1 AU (Astronomic Unit) – the measurement of the distance from the Earth to the Sun. The probe will take 5 years to get to the gas giant, which is 5 AUs from the Sun. At this distance, the solar cells will leave the spacecraft with 420 watts of electricity to run on.

o solar como eólico...

Japanese Solar Sail Headed for Venus and Beyond
An ambitious solar sail mission designed by Japan is poised for launch tomorrow could become the first successful mission powered solely by sunlight, but that's not all. The spacecraft is also aimed at Venus and beyond, and could pave the way for a future hybrid space engine. (...) "This will be the world's first solar powered sail craft employing both photon propulsion and thin film solar power generation during its interplanetary cruise," said a JAXA mission website. (...)
Ikaros (Interplanetary Kite-craft Accelerated by Radiation Of the Sun)is designed to unfurl its sail during its first stage by taking advantage of its spinning momentum, and then actively deploying the rest of the way during a second stage."The membrane is deployed, and kept flat, by its spinning motion; four masses are attached to the four tips of the membrane in order to facilitate deployment."