[Al Jazeera] NASA experts have expressed concern over an unprecedented "massive Martian dust storm" that has engulfed the Opportunity rover mission.The storm covers an area as large as North America and Russia combined - a quarter of the surface of Mars - and has left the golf-cart-sized rover temporarily unable to conduct science operations.
The US space agency's rover runs on solar power and has entered low power mode to conserve energy.
Mission engineers believe it is unlikely the rover has enough sunlight to charge back up for at least the next several days, NASA said in a statement earlier this week.