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What is the earliest point in the universe that we can observe? why can’t we see back further than this?
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The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?
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What makes some chemical bonds more stable than others...
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