The Philae lander seems doomed to sleep through most of its journey around the sun, but it did manage some nifty science before running out of juice:
http://www.bbc.com/news/science-environment-30097648
There seems to be some prospect of getting enough sunlight to power-up again; apparently its a "Goldilocks" problem: too much sunlight will destroy the probe, too little will not allow a recharge; here's hoping :)
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