 The continuous shadows in the south polar craters cause the floors of these formations to maintain a temperature that never exceeds about 100 K. For Shackleton , the average temperature was determined to be about 90 K , reaching 88 K at the crater floor . Under these conditions , the estimated rate of loss from any ice in the interior would be 10 − 26 to 10 − 27 m / s . Any water vapor that arrives here following a cometary impact on the Moon would lie permanently frozen on or below the surface . However , the surface albedo of the crater floor matches the lunar far @-@ side , suggesting that there is no exposed surface ice . 
 The continuous shadows in the south polar craters cause the floors of these formations to maintain a temperature <a href='null_relcl' title='1'><mark>that</mark></a>never <a href='uninflect' title='2'><mark>exceeds</mark></a> about 100 K. For Shackleton , the average temperature was determined to be about 90 K , reaching 88 K at the crater floor . Under these conditions , the estimated rate of loss from any ice in the interior would be 10 − 26 to 10 − 27 m / s . Any water vapor <a href='null_relcl' title='3'><mark>that</mark></a><a href='uninflect' title='4'><mark>arrives</mark></a> here following a cometary impact on the Moon would lie permanently frozen on or below the surface . However , the surface albedo of the crater floor <a href='uninflect' title='5'><mark>matches</mark></a> the lunar far @-@ side , suggesting that <a href='dey_it' title='6'><mark>there</mark></a> is no exposed surface ice . 
The continuous shadows in the south polar craters cuz the floors of these formations to maintain a temperature never exceed bou 100 K. For Shackleton , the average temperature was determined to be ababt0 K , reaching 88 K at the crater floor . Under these conditions , da estimated rate of loss from any ice in the interior would be 10 − 26 to 10 − 27 m / s . Any water vapor arrive heaa following a cometary impact on tdaMoon would lie permanently frozen on or below the surface . However , thdaurface albedo of the crater floor match thedanar far @-@ side , suggesting that it ain't no exposed surface ice .