Another crucial instrument on the Curiosity Mars rover has had its first test: the Dust Removal Tool, used to sweep dust from the rover's target rocks.
The fat, doughnut-shaped clouds of dust that surround about half of supermassive black holes could be the remnants of planets and asteroids that have smashed into each other at incredible speeds.
Researchers have developed a system allowing large-scale solar power installations to keep themselves clean, based on technology developed for missions to Mars.
