https://www.astro-init.top/index.php?action=history&feed=atom&title=2015IOAA%E7%90%86%E8%AE%BA%E7%9F%AD%E9%97%AE%E9%A2%98%E7%AC%AC7%E9%A2%98-%E6%98%9F%E5%9B%A2%E5%AF%86%E5%BA%A62015IOAA理论短问题第7题-星团密度 - 版本历史2026-05-04T08:23:18Z本wiki的该页面的版本历史MediaWiki 1.32.2https://www.astro-init.top/index.php?title=2015IOAA%E7%90%86%E8%AE%BA%E7%9F%AD%E9%97%AE%E9%A2%98%E7%AC%AC7%E9%A2%98-%E6%98%9F%E5%9B%A2%E5%AF%86%E5%BA%A6&diff=2173&oldid=prev某九流辣鸡民科：创建页面，内容为“==英文题目== A galaxy at the boundary of a galaxy cluster of radius 10 Mpc is expected to escape from the cluster if it has an initial velocity of at least 700 k…”2022-03-18T12:30:35Z<p>创建页面，内容为“==英文题目== A galaxy at the boundary of a galaxy cluster of radius 10 Mpc is expected to escape from the cluster if it has an initial velocity of at least 700 k…”</p>
<p><b>新页面</b></p><div>==英文题目==<br />
A galaxy at the boundary of a galaxy cluster of radius 10 Mpc is expected to escape from the cluster if it has an initial velocity of at least 700 km/s relative to the center of the cluster. Calculate the density of the cluster.</div>某九流辣鸡民科