A graph of Kardashev scale values during the late 20th century, projected into the early 21st century. Based on data at <a href="https://en.wikipedia.org/wiki/Kardashev_scale" class="extiw" title="w:Kardashev scale">Kardashev scale</a>.
<a href="//commons.wikimedia.org/w/index.php?title=User:Brianpeiris&amp;action=edit&amp;redlink=1" class="new" title="User:Brianpeiris (page does not exist)">Brianpeiris</a>
2008-08-19
<span class="int-own-work" lang="en">Own work</span>