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How did the universe begin? And what is its ultimate fate? The understanding that we have today was initiated by the work of Edwin Hubble. And building on his work, we are now certain that the universe is expanding. In fact, space is getting bigger at an increasing rate. We begin with the realization that the spiral nebulae are actually distant galaxies. At the beginning of the twentieth century, astronomers were taking the spectra of these galaxies that showed a displacement of the expected positions of absorption lines. The vast majority of the spectra of galaxies were red-shifted. This red shift was soon explained by having the galaxies moving away from us. Now we see that virtually all galaxies in the universe are moving apart from each other. Does that mean that everything in the universe is getting bigger? The rate of this expansion is repented in a calculated value known as the Hubble Constant.
Carpe Caelum Stellar Astronomy
Carpe Caelum Stellar Astronomy
Carpe Caelum Stellar Astronomy