What Did Radar Astronomers Find in the Polar Regions of Mercury

question 30

Multiple Choice

What did radar astronomers find in the polar regions of Mercury?

• A)rift valleys
• B)large mare basins, such as near our Moon's south pole
• C)water ice that never melts in the deep craters
• D)polar caps of dry ice that vary seasonally, much like Mars
• E)auroral displays much like Earth's

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