Kepler's discoveries regarding the motions of the planets were based on the observations of
copernicus
artistarchus
brahe
ptolemy

Which two particles are found in the center of an atom

Could we see a galaxy that is 20 billion light-years away?

Given the data calculated in parts a, b, c, and d, determine the initial rate for a reaction that starts with 0.85 m of reagent a and 0.70 m of reagents b and c?