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The life cycle of stars is on the order of billions of years, much lon

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New post 11 Jan 2019, 14:07
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The life cycle of stars is on the order of billions of years, much longer than a human life span or even the existence of astrophysics as a discipline. How do we understand the whole stellar life cycle? The Hertzsprung-Russell (HR) diagram sorts stars into different categories depending on their properties. Stellar clusters are collections of stars all the same age. The location of all the stars in a single stellar cluster on an HR diagram demonstrates the categories for stars at that particular age, and a comparison of plots on the HR diagram for multiple stellar clusters indicates how the different kinds of stars change over the course of their life cycles. The achievement is analogous to that of an imagined intelligent mayfly that, despite being alive for only a single day, is able to figure out the entire human life cycle by observing __________________.

Which of the following most logically completes the passage?
a. the students at a school that goes from kindergarten to the twelfth grade
b. a gathering of grandparents with their grandchildren
c. a college with reunions of all classes that graduated N years ago, where N is a multiple of five
d. the photos of a single living elderly individual, from early childhood to present day
e. a hospital with children and adult patients of all ages and a variety of conditions
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New post 12 Jan 2019, 22:45
Let's analyse the points stated,
1) Life span of stars munch higher than the humans, still can we study the life cycle of the stars
2) Through HR diagram, where can study the life cycle of a star by grouping a collection of similar age and properties
3)Changes w.r.t to time over their life cycle can be studied using multiple Stellar clusters
4)Similarly can we study the human life cycle?

Which of the following most logically completes the passage?
a. the students at a school that goes from kindergarten to the twelfth grade - we have students of same properties i.e., capabilities but we can't study a life span just by looking at a specific period.
b. a gathering of grandparents with their grandchildren - We don't have all age group people, to study the life span
c. a college with reunions of all classes that graduated N years ago, where N is a multiple of five - In general we have people of same capabilities admitted into a college, and with almost similar age group. Single 'N' is generalized and multiple of 5 we can have collection of different age group and how they change over the period.
d. the photos of a single living elderly individual, from early childhood to present day - Based on a single person life, that to his current age not mentioned can't predict the complete human life cycle
e. a hospital with children and adult patients of all ages and a variety of conditions - Do patients at a hospital similar age and similar Kind grouped together to study the human life cycle NO
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The life cycle of stars is on the order of billions of years, much lon   [#permalink] 12 Jan 2019, 22:45
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The life cycle of stars is on the order of billions of years, much lon

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