Solar energy waning
The chances of the Philae lander showing any sign of life are getting slimmer. Even though the Rosetta mission’s orbiter is making regular flybys of comet Churyumov-Gerasimenko, it is still 50 km from the nucleus. Of course, the closer it can get, the better its chances of restoring contact with the lander. On the other hand, as the comet is now hurtling away from the Sun, the lander’s small solar panels are receiving less sunlight and so their ability to generate power is inexorably waning.