text:  <unk> is an impact crater that lies at the south pole of the Moon . The peaks along the crater 's rim are exposed to almost continual sunlight , while the interior is <unk> in shadow ( a <unk> of eternal darkness ) . The low @-@ temperature interior of this crater functions as a cold trap that may capture and freeze <unk> shed during comet impacts on the Moon . Measurements by the <unk> <unk> spacecraft showed higher than normal amounts of hydrogen within the crater , which may indicate the presence of water ice . The crater is named after Antarctic explorer Ernest <unk> . 
  