Robot on Mars running out of juice

The team expects it to become inoperable by December, completing its mission on the red planet. The stationary lander arrived on Mars almost four years ago, to measure seismic activity. Achieved his scientific goals he already after a good two years, so that he has been on an “extended mission” ever since. Recently, however, the power supply has clearly decreased because the two 2.2 meter wide solar modules are covered with increasingly dense dust.