By analogy with lunar materials, all mapped crater materials are thought to be of impact origin.
Exciting work was accomplished by analyzing the lunar materials returned to Earth.
A second alien followed the path made by the first, also carrying lunar material.
The biological studies of the lunar material will seek to isolate and culture living organisms from the Moon.
These experimenters will describe the ultra-fine structure of lunar material.
The Harvard model produced the correct initial spin for Earth, but not enough lunar material.
His contributions to astronomy included the study of gas isotopes in meteorites and lunar materials.
He found no strictly lunar material which would serve for modeling or carving portraits.
About 400 kg of lunar material has been returned to the Earth from nine different sites on the Moon.
Other lunar material was collected by the Soviet Union's robotic spacecraft.
