Mars mega-storm threatens Nasa rover after 14-year mission

Experts have no idea what the landscape, or the Opportunity, will look like after storm raging across a quarter of the planet

Nasa's Mars rover Opportunity has been knocked out by a gigantic dust storm that is enveloping the red planet and blotting out the sun.

Officials said on Wednesday they were hopeful the rover would survive the storm, which already covers a quarter of Mars and is expected to encircle the planet in another few days. It could be weeks, or even months, until the sky clears enough for sunlight to reach the surface and recharge Opportunity's batteries through its solar panels.