In the modern theory, the bombing the star nucleus away was due to, the force of gravity., . drop in temperature., collision by asteroids., huge nuclear reactions., The building units of the universe are, planets, stars, galaxies, moons, The number of galaxies in the universe is about million galaxies., 10000, 100000, 20000, 200 000, The founder of the modern theory to explain the origin of the solar system is., Chamberlain, Moulton., . Fred Hoyle, Laplace.

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