What Is the Best Way to Estimate the Age of a Star

question 51

Multiple Choice

What is the best way to estimate the age of a star cluster?

• A) Plot the stars on a Hertzsprung-Russell diagram, and see which stars are still on the main sequence.
• B) Measure the motions of the stars in the cluster, and compare the measurements with theoretical models.
• C) Measure the heavy element abundance for the stars in the cluster.
• D) Count the number of T Tauri stars in the cluster.

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Definitions:

Non-native Species

Species that have been introduced to an environment where they are not naturally found, often having significant impacts on native ecosystems and species.

Agricultural Runoff

Water from rain or irrigation that carries soil, pesticides, and nutrients from fields into rivers, lakes, and other water bodies.

Fish Extinctions

The complete disappearance of fish species from the planet, often as a result of human activities, environmental changes, or natural events.

Marine Systems

Complex networks of oceanic and coastal habitats, organisms, and their interactions, instrumental in maintaining the planet's climate and biodiversity.