Why Is This Number The Greatest Unsolved Problem In Astronomy?
In the 1920s, Edwin Hubble made an important observation. He noticed that the farther a galaxy is in deep space, the faster it is moving away from us. This is known as Hubble’s law. While Hubble’s observations laid the foundation for an expanding universe and an initial big bang, it introduced one of the most controversial constants in cosmology, the Hubble constant.
For nearly a century, astronomers have tried to determine the value of the Hubble constant, but each attempt added more to the confusion.
So what is the Hubble constant all about? Why it broke a crisis in cosmology? Finally, and most importantly, why is it so difficult to determine the accurate value of the Hubble constant?
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