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One reason that ice being less dense than water is critical to life is that lakes and ponds would freeze from the bottom up, and that would much more likely to freeze solid. At the very least, if water behaved like every other material, life would have been completely different.
On the rotation/motion of our solar system around the Milky Way, I'm wondering if we can know what direction it is moving, in relation to the earth? The earth rotates west to east, and I *think* the earth orbits the sun in the "same" direction - but what direction does our solar system move?
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