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Unformatted text preview: Eric Couillard Astro 142 28 January 2008 Homework #2 1. m=3E41kg, M=6E41kg, F= 2E28N, F=G(mM)/r^2, r=(G(mM)/F)^(1/2), r=(6.7E- 11(3E41*6E41)/2E28)^(1/2)=2.45E22m. This means that if the two galaxies are 2.45x10^22 meters apart or less, then they will overcome this force that's causing them to move away from each other. 2. This is highly unlikely because a. Isotropic is defined as looking the same in all directions. Basically, when we look out into the night sky far enough with a telescope, this is precisely what we see. 3. The Universe is unstable under the physics of Newton because using his gravitational model, all matter is attracted other matter, so what would happen is that everything would be drawn into the biggest thing in the center of the universe, and eventually everything would collapse into the middle. Newton's reason for this not happening is that everything is spaced perfectly apart, so the pull of gravity from other places equals out, causing heavenly bodies to stay stationary...
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