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When the Moon reaches equal periods of orbital and rotational periods, it's known as _______ rotation. A. imbalanced B. non-conforming C. synchronous D. asynchronous
When the Moon reaches equal periods of orbital and rotational periods, it's known as C. [ synchronous The Moon is in synchronous rotation, meaning that it keeps the same face turned toward the Earth at all times. ]
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User: basic observation of a star is how bright it appears. A. apparent magnitude. B. luminosity. C. absolute magnitude. D. absent magnitude.

User: When the Moon reaches equal periods of orbital and rotational periods, it's known as _______ rotation. A. imbalanced B. non-conforming C. synchronous D. asynchronous

Weegy: When the Moon reaches equal periods of orbital and rotational periods, it's known as C. [ synchronous The Moon is in synchronous rotation, meaning that it keeps the same face turned toward the Earth at all times. ]
Expert answered|deathzyke|Points 31|

User: Large groups of galaxy clusters that appear in sheetlike and threadlike shapes are known as A. local clusters. B. Milky Way center. C. superclusters. D. large clusters.

Weegy: C. superclusters Galaxy groups and clusters are the largest known gravitationally bound objects to have arisen thus far in the process of cosmic structure formation. They form the densest part of the large-scale structure of the Universe. [ [ In models for the gravitational formation of structure with cold dark matter, the smallest structures collapse first and eventually build the largest structures, clusters of galaxies. Clusters are then formed relatively recently between 10 billion years ago and now. Groups and clusters may contain ten to thousands of individual galaxies. The clusters themselves are often associated with larger, non-gravitationally bound, groups called superclusters. ]
Expert answered|deathzyke|Points 31|

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Asked 7/14/2013 8:57:24 AM
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The dark, smooth surface areas of the Moon are known as A. craters. B. highlands. C. maria. D. rilles.
Question
Updated 3/8/2015 12:31:13 PM
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The dark, smooth surface areas of the Moon are known as maria.
Added 3/8/2015 12:31:12 PM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by yumdrea [3/8/2015 12:33:15 PM]
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