That's no good news for the lander, which already has its panels covered with some dust. Earlier this year, InSight tried to remove some of the fine particles by scooping up dirt with its robotic arm and placing it on one panel.
This interesting method actually worked. The wind kicked off the sand, which carried along with it some fine dust, ultimately cleaning up the panels and giving the spacecraft an energy boost. However, that's not to say that everything is dust-free now.
Particles continued to accumulate, making scientific operations more difficult as the available energy decreased. The current dust storm that forced InSight to go into safe mode was spotted by NASA's Mars Reconnaissance Orbiter. Using its onboard camera, the orbiter takes images that sometimes show how dust is taking over the Red Planet.
But there's some good news too. Data indicates that the storm is slowly dissipating. On January 10th, the InSight team was able to communicate again with the lander. This allowed them to check its power levels, which, although low, were stable.
The team hopes to be able to command InSight to exit safe mode next week. This will allow the lander to continue its scientific operations on the Red Planet.