&gt; Rocks in space are subject to a force&#x2F;pressure from the sun, a pressure comparable to that from a earthbound laser.<p>Hum, is it? When near the Sun, yes, of course, but when away from it, we can probably throw way more energy on it than the Sun.<p>Yes, it does require details that we currently can&#x27;t measure. The good new is that the laser doubles as an excellent instrument for measuring those details.