Examlex
Why is the CNO cycle the primary fusion cycle in only high-mass stars?
Concrete Operational
A stage in Piaget's theory of cognitive development, occurring from about 7 to 11 years old, where children gain the ability to think logically about concrete events.
Preoperational
The stage in Piaget's theory of cognitive development in which children from about 2 to 7 years old develop memory and imagination, but do not yet think logically.
Formal Operational Thought
A stage of cognitive development in which individuals are able to think abstractly, reason logically, and manage problems systematically.
Logical
Pertaining to the use of reason and sound judgment in thinking or arguing.
Q22: Eclipsing binary systems<br>A) orbit in the plane
Q26: Astronomers have identified examples of extraordinarily massive
Q34: Name two "rungs" in the distance ladder,
Q61: The <sup>8</sup>Be nucleus is highly unstable, and
Q72: At what wavelength(s) are H II regions
Q79: What type of spectrum do most stars
Q80: Halo stars near the Sun are distinguished
Q85: What is the difference between apparent brightness
Q86: The chemical composition of a star's atmosphere
Q87: What are the possible effects that a