USAAAO 2015, I кръг — Задача 12

USAAAO First Round 2015

Условие

Stars A and B are observed over a period of 1 year. Both stars appear to move with respect to the background stars from the position indicated on the left in the diagram below, to the position indicated on the right, and then back to the position on the left over the full year. Which star is further from the Earth?
a. Star A
b. Star B
c. Both stars are the same distance from the Earth
d. Not enough information given

Diagram showing two rows of star fields with Star A (top row) and Star B (bottom row) each shown at two positions marked with arrows indicating apparent back-and-forth motion against background stars over one year; Star A's arrow spans a larger apparent distance than Star B's.

Отговори

Решение

Оригинал в Архива: 2015-first-round-exam.pdf · официални решения: 2015-first-round-solutions.pdf