1.   He and a colleague were the first to report, last year, a practical method for extracting oxygen and water from lunar soil.

2.   Initially, their activities would be dedicated to testing machinery that extracts oxygen and hydrogen from the lunar soil.

3.   McKay has exercised those qualities on a variety of projects, often involving analysis of lunar soil to see what its mining potential might be.

4.   Silicon, aluminum and iron could be chemically extracted from lunar soil to make the solar cells, he said.

5.   Some scientists believe Prospec tor detected signs of water frozen in the lunar soil.

6.   Scientists measure the emissions to determine the surface composition of the lunar soil.

7.   Still another, a neutron spectrometer, will measure hydrogen, deposited in small amounts in the lunar soil by the solar wind.

8.   Such permanent shadow could cause water from impacting comets to remain locked in the lunar soil.

9.   These data were then tested by exposing the instruments to actual lunar soil samples that had been collected during the Apollo missions.

10.   Study leaders say the possible economic benefits include extracting oxygen from lunar soil.