What Did Radar Astronomers Find in the Polar Regions of Mercury

question 106

Multiple Choice

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

• A) polar caps of dry ice that vary seasonally, much like Mars
• B) auroral displays much like Earth's
• C) temperatures cold enough to allow thin sheets of water ice
• D) rift valleys
• E) large mare basins, such as near our Moon's south pole

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