Mars is littered with impact craters, but a circular shape seen near the South Pole raises some questions."Is that an impact crater?" That's the headline for a NASA image released on Tuesday from the Mars Reconnaissance Orbiter, which is currently traipsing above the Red Planet. It's a fun question. It's also a scientifically interesting one. The image shows a landscape that looks like the skin of a lizard. There's a circular feature that stands out in a field of roundish raised bumps. Most impact craters, usually caused by meteorites, are fairly easy to spot on Mars. This one is tricky, however. The circular feature is...CONTINUE READING
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