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    <title>counting &amp;mdash; Paul Sutton</title>
    <link>https://paper.wf/paulsutton/tag:counting</link>
    <description>Paul Sutton - personal blog </description>
    <pubDate>Thu, 07 May 2026 01:24:10 +0000</pubDate>
    <item>
      <title>There are 40 quintillion black holes in our Universe</title>
      <link>https://paper.wf/paulsutton/there-are-40-quintillion-black-holes-in-our-universe</link>
      <description>&lt;![CDATA[There are 40 quintillion black holes in our Universe &#xA;&#xA;This is a huge number,   I think this something like 40 10^24&#xA;&#xA;or 40,000,000,000,000,000,000,000,000&#xA;&#xA;Which is according to Scientists is the estimate of the number of black holes in the galaxy.  The article on big think is here&#xA;&#xA;This is why we use SI units and express huge numbers in powers.  So 10^6 is a million or 1,000,000 for example.  &#xA;&#xA;It also makes it easier to multiply together as&#xA;&#xA;10^6 x 1000 = 10^6 x 10^3 = 10^{6+3} = 1,000,000,000 or 10^9&#xA;&#xA;Tags&#xA;&#xA;#Space,#Astronomy.#Blackholes,#Counting,#Estimate]]&gt;</description>
      <content:encoded><![CDATA[<p>There are 40 quintillion black holes in our Universe</p>

<p>This is a huge number,   I think this something like 40 10^24</p>

<p>or 40,000,000,000,000,000,000,000,000</p>

<p>Which is according to Scientists is the estimate of the number of black holes in the galaxy.  The article on <a href="https://bigthink.com" rel="nofollow">big think</a> is <a href="https://bigthink.com/starts-with-a-bang/40-quintillion-black-holes-in-universe/" rel="nofollow">here</a></p>

<p>This is why we use SI units and express huge numbers in powers.  So 10^6 is a million or 1,000,000 for example.</p>

<p>It also makes it easier to multiply together as</p>

<p>10^6 x 1000 = 10^6 x 10^3 = 10^{6+3} = 1,000,000,000 or 10^9</p>

<p><strong>Tags</strong></p>

<p><a href="/paulsutton/tag:Space" class="hashtag" rel="nofollow"><span>#</span><span class="p-category">Space</span></a>,<a href="/paulsutton/tag:Astronomy" class="hashtag" rel="nofollow"><span>#</span><span class="p-category">Astronomy</span></a>.<a href="/paulsutton/tag:Blackholes" class="hashtag" rel="nofollow"><span>#</span><span class="p-category">Blackholes</span></a>,<a href="/paulsutton/tag:Counting" class="hashtag" rel="nofollow"><span>#</span><span class="p-category">Counting</span></a>,<a href="/paulsutton/tag:Estimate" class="hashtag" rel="nofollow"><span>#</span><span class="p-category">Estimate</span></a></p>
]]></content:encoded>
      <guid>https://paper.wf/paulsutton/there-are-40-quintillion-black-holes-in-our-universe</guid>
      <pubDate>Tue, 31 Oct 2023 16:44:30 +0000</pubDate>
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