thalion: Good post.<br /><br />Claywoman: Don't get frustrated at a long time for a response. This board (especially the science sections) can be slow. Many people don't feel up to the task of answering, or don't know. And so they wait.<br /><br />I think they're more qualified than they think, and should pipe up. And if they're mistaken a bit, another persons response should help clear it up. <br /><br /><br />But, as thalion says, color is an indication of temperature (which is intimately related with spectral type) not age. At least, not a direct indication of age.<br /><br />From that, and other clues, mass and age can be estimated. <div class="Discussion_UserSignature"> <p align="center"><font color="#c0c0c0"><br /></font></p><p align="center"><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">----</font></em></font><font color="#666699">SaiphMOD@gmail.com </font><font color="#999999"><em><font size="1">-------------------</font></em></font></p><p><font color="#999999"><em><font size="1">"This is my Timey Wimey Detector. Goes "bing" when there's stuff. It also fries eggs at 30 paces, wether you want it to or not actually. I've learned to stay away from hens: It's not pretty when they blow" -- </font></em></font><font size="1" color="#999999">The Tenth Doctor, "Blink"</font></p> </div>