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How were new craters on Mars discovered?

Oxford Sparks Big Questions

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Did You Find Similar Things With Ice and Water as You Did With the Christmas-Y Crater?

Two new craters have been spotted on the surface of Mars in 90 days. It is difficult to say that they were linked to a same event, but it's closer than we would have expected. But equally, it's hard to imagine what it might have been that would have produced two signals 90 days apart. Are you still looking for more black splotches then? Yeah, we are. We know something about how often we see new creators in images from orbit because we've been taking pictures of the surface of masks for years.

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