USAAAO 2018, I кръг — Задача 20
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 happens to the core of a star after a planetary nebula occurs?
A. It contracts from a protostar to a main-sequence star
B. It breaks apart in a violent explosion
C. It becomes a white dwarf.
D. It becomes a neutron star
E. none of the above
Решение
Answer: C
Оригинал в Архива: usaaao-first-round-exam-2018.pdf · официални решения: usaaao_first_round_2018.pdf