A Particular Star Shows Spectral Lines of the Lithium Isotope

question 7

Multiple Choice

A particular star shows spectral lines of the lithium isotope ⁶Li.What conclusion do astronomers draw from this observation?

• A) The star has vaporized one of its planets that spiraled in too close to the star because the star's own ⁶Li was destroyed by nuclear reactions long ago.
• B) The star has not yet begun nuclear reactions in its core because these reactions destroy ⁶Li.
• C) Planets must be orbiting around the star because only planets show ⁶Li spectral lines.
• D) The star is composed of pristine (unmodified) material from the Big Bang because ⁶Li has been destroyed in material that has been processed in stars and expelled back into space.

---

Definitions:

HIV Infection

A virus that attacks the immune system, specifically the CD4 cells, leading to a gradual deterioration in immune function.

Dying Role

The social and psychological processes individuals experience as they approach the end of life.

Sick Role

A concept in medical sociology that describes the rights and obligations of a person who is duly recognized as being ill, including being exempt from social responsibilities and the expectation to seek treatment and cooperate in the process of recovery.

Loved One

A term referring to someone whom an individual has deep affection for, typically a family member or close friend.