After the sun, the closest star to Earth is Proxima Centauri. The next closest star is called Rigel Kentaurus (aka Alpha Centauri). Rigel Kentaurus is about 4.3 light-years from Earth. How many parsecs away is Rigel
Kentaurus? Round your answer to the nearest tenth of a parsec.

ń, wǒ shuō yīngyǔ, dàn wǒ huì shuō qítā yǔyán, rú xībānyá yǔ fǎyǔ yìdàlì yǔ hé pǔtōnghuà, suǒyǐ bùyào pànduàn, dànshì

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.