# New Space Needs a Mission

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#### ThereIWas2

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<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Earth L-4 & L5 are unstable for objects beyond a certain size. Over that size it takes increasing amounts of Dv to keep the object there. This Dv is orders of magnitude less than what would be required for station keeping outside of a Lagrangian point.&nbsp; <br /> Posted by boris1961</DIV></p><p>What order of magnitude is "a certain size"?</p><p>&nbsp;</p> <div class="Discussion_UserSignature"> <p><span class="postbody"><span style="font-style:italic"><br /></span></span></p> </div>

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Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>What order of magnitude is "a certain size"?&nbsp; <br />Posted by ThereIWas2</DIV><br /><br /><font size="2">I can't do the math & I can't find the original thread from Uplink where we discussed it, but an object in can stay put even if it does require a small amount of station keeping thrust.</font>&nbsp; <div class="Discussion_UserSignature"> <font color="#993300"><span class="body"><font size="2" color="#3366ff"><div align="center">. </div><div align="center">Never roll in the mud with a pig. You'll both get dirty & the pig likes it.</div></font></span></font> </div>

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