if you are interested in the planetary sciences, i'd suggest starting with geology, and some meteorology thrown in, with a heavy dose of physics.<br /><br />You're best bet on what to study is go to the astronomy dept at the University you are attending (plan to attend) and chat with one of the professors. Even if they don't actually do planetary astronomy, they'll know enough to get you started on a good path.<br /><br />BTW, astronomy is a hard and very competitive field. Only ~10% of new Ph.d.'s get a job in the field (and they've also got to compete with the left-overs from other years)...and the job turnover isn't that high either. There are only a few thousand astronomy positions world-wide.<br /><br />Now, industry jobs that use the astronomy based knowledge you know..aren't that rare. Nearly 100% of astronomy Ph.d.'s get a job...it's only a small portion that stay directly in the field though.<br /><br />but...math, math, math, math. Work hard to ace those math classes, trust me, I wish I had. <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>