Science: Moon Mirror

Life does not exist on Mars or any other solar planet except Earth, in the opinion of Dr. Walter Sydney Adams, director of Mt. Wilson Observatory. Mars, most propitious of Earth's neighbors, is not only inhospitably cold and scantily watered, but also almost devoid of oxygen. Some months ago Dr. Adams and Dr. Theodore Dunham Jr. trained spectroscopes on the red planet, computed that it has under 1% as much free oxygen as Earth has.

Dr. Adams wondered whether the lack of oxygen lines in his spectrum was due to interference by light from other gases in the Martian atmosphere.

Possibly a spectroscope,...