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Message: <blockquote data-quote="lgburton" data-source="post: 2347001" data-attributes="member: 30653">viva la red dwarf main-sequence stars! <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=";)" title="Wink    ;)"  data-smilie="2"data-shortname=";)" />neet - i'm actually very interested in seeing the difference. the entire idea of an orbital body keeping a planet tectonicly active interests me... what % of the larger body's mass is needed for a moon to keep a planet viable? how would this relate to the pluto/charon system, since charon is a signifigant % of pluto's mass? hmm...well, yes, but there has been a logical consistancy with all of the points you've made, so i'm wondering what theoretical model you are working with, if at all? if not, hey, it's a good question to get you started making one! <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=";)" title="Wink    ;)"  data-smilie="2"data-shortname=";)" />a lot of my reaction is in the very question of tectonics: you're calling plate tectonics a symptom, rather than a cause - but no really good theoretical models have managed to explain why, of all the rocky worlds, earth seems to be the only one to exhibit plate tectonics. (though there is one other example in the solar system - europa's ice sheets seem to work similarly). so, could it be lunar tidal stress that causes earth's surface and venus' surface to work so very differently? sure.. but how?totally, and that's one of the reasons i got involved in  the discussion <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile    :)"  data-smilie="1"data-shortname=":)" />. mostly i'm replying to you with questions i don't know the answers to, and seeing if you can come up with something that makes sense. mostly, your answers make sense, and when they don't i'm more prodding you with my questions trying to get a different kind of explanation, so that I can understand where you are coming from, rather than trying to goad you into a flame war. (despite my overall obnoxious and combative tones... sorry).</blockquote>

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