USAAAO 2026, I кръг — Задача 18

USAAAO 2026 - First Round · 9 февруари 2026 г.

Problem writers

Problem writers: Srihari (Hari) Balaji, Vincent Bian, Ferdinand, Hagan Hensley, Elizabeth Lee, Joe McCarty, Lucas Pinheiro, Feodor Yevtushenko

Условие

The most distant known galaxy, MoM-z14, was recently observed by the James Webb Space Telescope and has a redshift of $z = 14.44$. If the current cosmic microwave background (CMB) temperature is 2.725 K, what was the CMB temperature at MoM-z14?

(a) 0.1887 K

(b) 39.35 K

(c) 42.07 K

(d) 568.2 K

(e) 3208 K

Отговори

Решение

---

Оригинал в Архива: usaaao_first_exam_2026.pdf · официални решения: usaaao_first_exam_solutions_2026.pdf