Mars is infamous for intense dust storms. Right now, a massive Martian dust storm is affecting operations of our Opportunity rover. This storm is already one of the most intense ever observed on the Red Planet. The storm, which was first detected by our Mars Reconnaissance Orbiter on May 30, has grown to cover more than 15.8 million square miles (41 million square kilometers) as of June 10 – an area about the size of North America and Russia combined. It has blocked out so much sunlight, it has effectively turned day into night for Opportunity, which is located near the center of the storm, inside Mars' Perseverance Valley. These two views from our Mars Curiosity rover, acquired specifically to measure the amount of dust inside Gale Crater, show that dust has increased over three days from a major Martian dust storm. In the first image, we see a view of the east-northeast rim of Gale Crater on June 10, 2018 (Sol 2077). Swipe to see a view of the same feature on June 7, 2018 (Sol 2074)...