<story><title>How Raganwald Lost His Crown</title><url>http://braythwayt.com/2017/12/29/crown.html</url></story><parent_chain><item><author>braythwayt</author><text>Disclosure: A rare self-post. I&amp;#x27;d be very grateful for any and all corrections to the story, as I am far from an expert is astrophysics, geology, or pretty-much anything else.</text></item></parent_chain><comment><author>gwking</author><text>&amp;gt; At some point, a satellite the size of Mars came crashing into the earth, so hard and so fast that about a third of the earth was blasted into space. It didn’t go far–the debris formed a ring around the earth, and gravity eventually compacted it into a single satellite, our moon, but a satellite much larger than our planet’s gravity would normally be able to capture.&lt;p&gt;Something seems off about &amp;quot;a third&amp;quot;: according to &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Moon&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Moon&lt;/a&gt;, the Moon&amp;#x27;s radius is a bit less than a third of Earth&amp;#x27;s, but its volume is 2% and its mass is just 1%. I&amp;#x27;m no expert, but &amp;quot;about a hundredth&amp;quot; seems more accurate.&lt;p&gt;For what it&amp;#x27;s worth, I only looked it up because I&amp;#x27;ve come across this discrepancy before, so perhaps I&amp;#x27;m missing something!</text></comment>
<story><title>How Raganwald Lost His Crown</title><url>http://braythwayt.com/2017/12/29/crown.html</url></story><parent_chain><item><author>braythwayt</author><text>Disclosure: A rare self-post. I&amp;#x27;d be very grateful for any and all corrections to the story, as I am far from an expert is astrophysics, geology, or pretty-much anything else.</text></item></parent_chain><comment><author>WaxProlix</author><text>&amp;gt; I would have found that while my scale tells me that I am about 86 kilograms on Earth, I would have weighed 8.6 trillion kilograms on this neutron star.&lt;p&gt;Kilograms are a measure of mass, not weight. Pounds would be a more appropriate unit there.</text></comment>