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Index (O)
OA - OC
OD - OF
OG - OJ
OK - ON
OO - OR
OS - OV
OW - OZ
Moment of truth
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More than 25 million people died in Europe from the bubonic plague (the black death) in five years, from 1347 to 1352. |
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OO - OR
Oort Cloud Astron.
A speculative, huge spherical region of space surrounding the Solar System extends from outer edge of Kuiber Belt region to about 3 light years from the Sun. The region may contain about 1012 comets millions of kilometers apart from
one another. It is believed that long-period comets may have come from this region. The Cloud is thought as a spherical region because comets appear at anytime and come from all directions. Such a Cloud was first suggested by Jan Hendrik Oort, a Dutch astronomer.
ore dressing Min. Ext.
See beneficiation
organelle Biol.
A defined cell structure that carries out a specific function in the life of a cell. For example, mitochondrion, lysosome etc.
OO - OR
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