Why does the habitable zone shift outward as a star evolves?
A)The star produces more radiation as it ages on the main sequence.
B)The star produces less radiation as it ages on the main sequence.
C)The planets adaptive mechanisms shift toward producing a more habitable environment.
D)The planets adaptive mechanisms shift toward producing a less habitable environment.

Question

Quizplus · Accepted Answer

As a star ages on the main sequence, it burns hydrogen in its core, which causes it to gradually increase in luminosity and emit more radiation. This increase in radiation output causes the habitable zone, the region around a star where conditions may be right for life to exist, to shift outward.

Why Does the Habitable Zone Shift Outward as a Star