About关于

What This Site Is, and Is Not

这个站点是什么，不是什么

Sources, how the lab grades an answer, and the limits we keep to.

资料来源、互动练习怎样判分，以及我们守住的边界。

What is here这里有什么

A study site for the British Astronomy and Astrophysics Olympiad (BAAO), one of the BPhO family of sites on tian-2.com: an interactive lab of past questions (4 of 4 modules ready so far), an answers-only question bank of the Astro Challenge papers, and the Astro Challenge solutions book. The other competitions of the family, from Round 0 to Round 2, are on the BPhO site.

一个面向英国天文与天体物理奥赛（BAAO）的学习站点，属于 tian-2.com 上的 BPhO 赛事家族：真题互动练习（目前已完成 4 个模块中的 4 个）、只给答案的 Astro Challenge 真题题库，以及 Astro Challenge 题解书。赛事家族中的其他比赛（从 Round 0 到 Round 2）见 BPhO 站点。

The BAAO bank shows the final answer to each question or part, not the working. An answer is what you need to check your own attempt; the full worked solutions are what the book is for. The interactive lab is the exception: its questions are worked in full, as a free sample.

BAAO 题库只给每道题（或每一问）的最终答案，不给过程。核对自己的解答只需要答案；完整解答是题解书的职责。互动练习是例外：其中的题目都有完整讲解，作为免费样章开放。

Sources来源

The official pages. Every competition fact (formats, dates, eligibility, how the competitions connect) is taken from the public pages of bpho.org.uk for the 2025–26 cycle, archived when this site was written. Dates change every year; the official site is the authority.官方页面。所有赛事信息（形式、日期、资格、各项比赛之间的衔接）都取自 bpho.org.uk 2025–26 赛季的公开页面，并在编写时存档。日期每年都会变，一切以官网为准。
Our solution books. The question bank is built from the source files of our BAAO books.我们的题解书。题库由 BAAO 题解书的源文件整理而来。
The official papers. The lab reproduces questions from the published BAAO papers; the analyses, visualisations and solutions are our own.官方试卷。互动练习中的题目取自已公布的 BAAO 试卷；分析、可视化与解答均为本站原创。

How the lab grades an answer互动练习怎样判分

Numerical answers are graded with a tolerance, usually two per cent, so a correctly rounded value is accepted. Marks are given in proportion to the parts you get right; each hint you open takes a quarter off, never below a quarter, and opening the full solution first means the attempt is not scored.

数值答案判分留有容差（通常为 2%），四舍五入正确的数值都算对。按答对的小问比例给分；每看一条提示扣四分之一（最低保留四分之一），先看完整解答再作答则不计分。

What this site is not这个站点不是什么

Not official. This is an independent study site. It is not affiliated with or endorsed by the British Physics Olympiad or the BAAO.不是官方。这是独立的学习站点，与英国物理奥林匹克及 BAAO 无隶属关系，亦未获其认可。
Not a mark scheme. The lab and the bank judge a final result; a marker awards marks for working. Show your working on the day.不是评分标准。互动练习与题库只核对最终结果，而阅卷按过程给分。考试时一定要写出过程。
Not a threshold. No page states the marks needed for any award.不给分数线。任何页面都不写获奖所需分数。
Not a record of you. Lab progress and language choice are stored only in your browser’s local storage. Nothing is sent anywhere.不记录你。练习进度与语言选择只存在你浏览器的本地存储里，不会上传到任何地方。

Copyright版权

Past-paper questions and their figures are © British Physics Olympiad and appear here for study. The analyses, answers, visualisations and solutions are original work. For the papers themselves, go to the official BAAO pages.

真题题目及其配图版权归 British Physics Olympiad 所有，在此用于学习。题目分析、答案、可视化与解答均为本站原创。试卷原文请到官方 BAAO 页面查阅。