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      <span class="heading">Galileo's Telescope</span></TD>
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      Galileo invented many mechanical devices other than the pump, such as the 
      <A HREF="../sci/instruments/balance.html">hydrostatic balance</A>. But perhaps 
      his most famous invention was the <A HREF="../sci/instruments/balance.html">telescope</A>. 
      Galileo made his first telescope in 1609, modeled after telescopes produced 
      in other parts of Europe that could magnify objects three times. He created 
      a telescope later that same year that could magnify objects twenty times. 
      With this telescope, he was able to look at the <A HREF="../sci/observations/moon.html">moon</A>, 
      discover the four <A HREF="../sci/observations/jupiter_satellites.html">satellites 
      of Jupiter</A>, observe a supernova, verify the phases of Venus, and discover 
      <A HREF="../sci/observations/sunspots.html">sunspots</A>. His discoveries 
      proved the <A HREF="../sci/theories/copernican_system.html">Copernican system</A> 
      which states that the earth and other planets revolve around the sun. Prior 
      to the Copernican system, it was held that the universe was <A HREF="../sci/theories/ptolemaic_system.html">geocentric</A>, 
      meaning the sun revolved around the earth. </TD>
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    <TD WIDTH="208" HEIGHT="91" align="left" valign="top"> <P class="sources">Text, 
        design, and layout by Megan Wilde for the Electronic Text Center. This 
        biography is based upon information culled from The Galileo Project website. 
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