United States Army Materiel Command. The U.S. Army Materiel Command (AMC) is the primary provider of materiel to the United States Army. The Command's mission includes the research & development of weapons systems as well as maintenance and parts distribution.
A comet is a small, icy object that orbits the sun and has a long tail of gas. Some comets can be seen from Earth every few years, while others pass by once in a person's lifetime. Comets are made of ice, dust, and tiny pieces of rock, but to people on Earth, they look like streaks or smudges across the night sky.
(plural albedos or albedoes) ( 1 physics, meteorology, astronomy) The fraction of incident light or radiation reflected by a surface or body, commonly expressed as a percentage. ( biology) The whitish inner portion of the rind of citrus fruits that is a source of pectin, commonly referred to as the pith.