What Can We Learn About a Star from a Life

question 109

Multiple Choice

What can we learn about a star from a life track on an H- R diagram?

• A)how the star's distance from Earth varies at different times in its life
• B)the star's age
• C)the star's current stage of life
• D)the surface temperature and luminosity the star will have at each stage of its life

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Definitions:

TSH

Thyroid Stimulating Hormone, a hormone produced by the pituitary gland that regulates the production of thyroid hormones.

Hormones

Chemical messengers produced by glands in the body, regulating various physiological processes and behavior.

ACTH

Adrenocorticotropic Hormone, a peptide hormone produced by the pituitary gland that stimulates the production of cortisol by the adrenal glands.

Cortisol

Cortisol is a steroid hormone released by the adrenal glands, often in response to stress and low blood-glucose concentration.