USAAAO 2018, I кръг — Задача 27
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
In the 1920s Harlow Shapely estimated the size of the Milky Way galaxy using which of the following?
A. RR Lyrae stars
B. Pulsating asymptotic giant branch stars
C. Type Ia supernovae
D. Type II supernovae
E. white dwarf stars
Решение
Answer: A
Shapely used RR Lyrae stars to estimate the size of the Milky Way galaxy.
Оригинал в Архива: usaaao-first-round-exam-2018.pdf · официални решения: usaaao_first_round_2018.pdf