Tag: dry ice
San Francisco cleans up a lot of graffiti every year. In the past, the city has used standard industrial solvents for this task, but now, workers will be cleaning up with non-toxic materials, in an effort to protect people and reduce toxic runoff.
NASA's Mars Reconnaissance Orbiter and its high-powered HiRISE camera has been capturing extremely detailed pictures all over the surface of Mars for a few years now. MRO now reveals a number of surprising, curious, and often captivating landscape features, many of which have inferred the action of dynamic weather processes on Mars.