USAAAO 2018, I кръг — Задача 18
USAAAO National Astronomy Olympiad First Round 02/12/2018-02/16/2018 Time Limit: 75 Minutes · 12 февруари 2018 г. · 1 т.
Внимание: Бележка към темата
The solutions document provides answer letters for all 30 problems and brief explanations for some problems.
Условие
What do the cores of low-mass and high-mass main-sequence stars have in common?
A. Both have a uniform composition
B. Both are burning hydrogen
C. Both are convective
D. Both are radiative
E. Both are contracting
Решение
Answer: B
Оригинал в Архива: usaaao-first-round-exam-2018.pdf · официални решения: usaaao_first_round_2018.pdf