Astronomy Question of the Week 4/02

[tfwthom]

Since I got clouded out on the Messier Marathon I'll post a question.<br /><br /><span method="POST" action="/dopoll.php"></span> <br /> <div class="Discussion_UserSignature"> <font size="1" color="#3366ff">www.siriuslookers.org</font> </div>

 

[thepiper]

It's easy if one knows the famous mnemonic phrase to remember the order.

 

[tfwthom]

(Total Votes: 12) <br />Callisto <br /> 0 (0%) <br /> <br />Europa <br /> 0 (0%) <br /> <br />Ganymede <br /> 0 (0%) <br /> <br />Io <br /> 12 (100%) <br /> <br />Io<br /><br />Io, pronounced the way it is spelled, is remarkable for it's active volcanoes. In 1979, data from Voyager 1 showed that geysers of molton sulfer shoot as high as 300 kilometers above Io's surface. Tidal forces between Io and its neighbor moon Europa, provide the heat that drives the continuous volcanism.<br /> <div class="Discussion_UserSignature"> <font size="1" color="#3366ff">www.siriuslookers.org</font> </div>