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Message: <blockquote data-quote="Greenfield" data-source="post: 5563828" data-attributes="member: 6669384">Wow!  Just wow. From "basic physics" to theoretical quantum dispersion of mass into a semi-static wavefront, in one paragraph.  I'm impressed.Okay, let's play along.  Let's all accept that Conservation of Momentum doesn't apply to polymorphs, but does to straight size changes.So, when I shrink that boulder with Shrink Object, it should still accelerate to 63,500 x 4096 miles per hour, minus the current orbital+rotational velocity, for a total of 260,032,500 miles per hour relative to it's starting movement.  That's a shade over 35% of the speed of light.  (The spell reduces by a factor of 16 in each dimension, so the mass loss would be 16**3, or 4096).And "Shrink boulder to pebble", as mentioned, would accelerate to an even higher speed, since the mass change is that much more drastic.  See the problem?  Your basic presumption is one contrary to "basic physics".  You're acting is if the world were stationary, and the sun and stars all orbit around it.  Of course, the D&D world never had a Tycho Brahe or Galileo to prove otherwise, so... <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=":)" /></blockquote>