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Toys and games
1) Devices that are used exclusively for recreation and play. Toys are most often used with children and pets and as a medium of education and development. Toys are not always obvious in their nature. A simple bottle can be considered a toy if an individual uses it for recreational use. 2) Games are structural activities used for physical or psychological education. In most cases, games are recreation. However, games can also be considered work. For example, a professional soccer game is a career to the participants.
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artificial satellite
Astronomy; General astronomy
a satellite made by humans which is gravitationaly bound and in orbit of a larger physical object
ascending node
Astronomy; General astronomy
In the orbit of a solar-system body, the point where the body crosses the ecliptic from south to north: for a star, out of the plane of the sky toward the observer.
aspheric
Astronomy; General astronomy
An optical surface with departures in shape from a perfect sphere in order to cancel optical imperfections or aberrations.
association
Astronomy; General astronomy
A sparsely populated grouping (mass range 102-103 Msun) of very young, massive stars lying along a spiral arm of the Milky Way, whose spectral types or motions in the sky indicate ...
asterism
Astronomy; General astronomy
a group of bright stars which form a conspicuous pattern on the celestial sphere
asteroid (minor planet, planetoid)
Astronomy; General astronomy
Also called planetoids or minor planets, the asteroids are tiny planets most of which orbit the Sun between Mars and Jupiter. The largest - and the first discovered - is Ceres, ...
