15. How will the Sun appear as a red giant, compared to today?(B is not correct)

Question

15. How will the Sun appear as a red giant, compared to today?(B is not correct)

Select one:

A. hotter and brighter

B. cooler and dimmer

C. hotter and dimmer

D. the same temperature and brightness

E. cooler and brighter

16.What will happen to the Earth during the Sun's red giant phase? ( A is not correct)

Select one:

A. Earth will be engulfed by the expanding Sun.

B. Earth will escape from the Sun's gravity as it loses mass, drifting into interstellar space.

C. Earth's surface will be scorched by the Sun's increasing luminosity.

D. Earth will migrate into the outer solar system, eventually being captured by Jupiter.

Explanation / Answer

15) E

Red Giant is a phase of the star in its last stages. During this phase the sun will expand around ten times or more larger than its present size. Red giants have exhausted supply of hydrogen in its core and utilizes hydrogen from the shells surrounding the core. Despite lower energy it have enormous size making its luminosity several times more than present. Due to its larger size the energy spreads outward inturn lowering its temperature.

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