The closest known star to our solar system is Alpha Centauri, which is approximately 4.30 light-years away. A spaceship with a constant speed of 0.800c relative to the earth travels from Earth to this star. How much time would elapse during the trip on a clock on board the spaceship?

2.58 years.

Explanation:

Δtr ⇒ Δto  √1-v2 / c2

answer at the divergent plate boundary in the middle of the ocean;

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.