A Star Can Be a Supernova

question 73

Multiple Choice

A star can be a supernova:

• A)in predictable cycles of decades.
• B)a few times, at unpredictable intervals.
• C)only if it can fuse iron in its core.
• D)before it reaches the main sequence, if it is massive enough.
• E)only once.

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Definitions:

Lurking Variables

Unobserved variables that can influence the observed relationship between other variables of interest.

Placebo

A harmless pill, medicine, or procedure prescribed more for the psychological benefit to the patient than for any physiological effect.

Fertilizer

A chemical or natural substance added to soil or land to increase its fertility.

Sunlight

Electromagnetic radiation emitted by the Sun, essential for life on Earth, influencing climate and weather patterns and providing energy for photosynthesis in plants.