Milky Way

提供银河系的基本结构、恒星数量、中心黑洞、旋臂分布及暗物质影响等科学天文知识。

Security Scan

This is a read-only, instruction-only educational skill about the Milky Way; it requests no credentials, installs nothing, and its behavior matches its description.

Purpose & Capability

The name and description (Milky Way overview) align with the SKILL.md content: educational astronomy text and short triggers for when to show it. Nothing requested or declared is unrelated to that purpose.

Instruction Scope

SKILL.md contains only explanatory text and 'read_when' triggers. It does not instruct the agent to run commands, read files, access environment variables, or transmit data to external endpoints.

Install Mechanism

No install spec and no code files are present; this is the lowest-risk pattern (instruction-only). Nothing will be written to disk or downloaded.

Credentials

The skill declares no required environment variables, credentials, or config paths—proportionate and minimal for an educational content skill.

Persistence & Privilege

always is false and the skill is user-invocable; it does not request elevated persistence or modify other skills. Autonomous invocation is allowed by platform default but presents no extra risk here because the skill is read-only and has no credentials.

Assessment

This skill is an informational, read-only content bundle and appears safe to install. It will not access your files, credentials, or network on its own. Before relying on it for research, consider that the SKILL.md contains no citations; if you need authoritative or up-to-date measurements (e.g., star counts, black hole mass, or dark matter fractions), prefer sources from peer-reviewed literature or major observatories and ask the skill author to add references. If you require the agent to fetch live data, expect that would require a different skill with explicit network/credential requirements—review those carefully.

银河系：我们在这颗尘埃上的全景视角

1610 年，伽利略把望远镜对准了夜空中那条模糊的白色光带。他看到的不再是神话中"女神洒落的牛奶"（拉丁语 Via Lactea），而是无数颗恒星密集排列形成的光河。人类第一次意识到：我们生活在一个巨大的恒星系统之中。

银河系是什么样的？

• 🌀 它是一个棒旋星系（barred spiral），直径约 10 万光年
• ⭐ 包含 1000-4000 亿颗恒星——我们太阳只是其中之一
• 🕳️ 中心有一个超大质量黑洞"人马座 A*"，质量约 400 万倍太阳质量
• 🌍 太阳系位于一条名为"猎户臂"的旋臂上，距离银心约 26,000 光年

你绕银河系转一圈需要多久？ 太阳以约 220 km/s 的速度绕银心公转，走完一圈大约需要 2.25-2.5 亿年——这被称为一个"银河年"。上一次太阳在现在这个位置时，地球上还是恐龙的时代。

我们如何知道自己住在什么样的星系里？ 这就像一个蚂蚁试图描述整个蚁巢的形状——你身在其中的时候很难看到全貌。天文学家通过观测其他类似的星系、测量银河系内恒星的分布和运动、利用红外线和射电望远镜穿透银河系的尘埃带，才逐步拼出了银河系的结构图。

暗物质的秘密：银河系的可见物质（恒星、气体、尘埃）只占总质量的大约 15%。其余 85% 是看不见的暗物质。它不发光、不发热、不与电磁力作用，但它的引力控制着银河系的旋转方式。理解银河系中的暗物质分布，是理解宇宙中"缺失的质量"的关键线索。

未来：大约 45 亿年后，银河系将与附近的仙女座星系（M31）发生碰撞和合并。届时两个星系将融合成一个更大的椭圆星系——天文学家已经给它起了个名字叫"Milkomeda"。不过别担心——到那时太阳可能已经变成红巨星，人类需要担心的事情远不止星系碰撞。