A Particular Star Shows Spectral Lines of the Lithium Isotope

question 60

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.

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Definitions:

Emotional Behavior

Actions and reactions that are a direct expression of emotions, reflecting how an individual feels and responds to certain situations or stimuli.

Cerebral Hemisphere

One of the two symmetrical halves of the brain, the left and the right hemispheres, each responsible for different functions and cognitive processes.

Motor Functions

The physiological processes that involve the coordination and execution of voluntary and involuntary movements by the motor system.

Parietal Lobe

One of the four main lobes of the brain, responsible for processing sensory information regarding the location of parts of the body as well as interpreting visual information and processing language and mathematics.