Now, almost one hundred years later, it is difficult to fully appreciate how much our picture of the universe has changed in the span of a single human lifetime. As far as the scientific community in 1917 was concerned, the universe was static and eternal, and consisted of a one single galaxy, our Milky Way, surrounded by vast, infinite, dark, and empty space. This is, after all, what you would guess by looking up at the night sky with your eyes, or with a small telescope, and at the time there was little reason to suspect otherwise. Lawrence M. Krauss
About This Quote

Today, we see the universe as a dynamic, ever-evolving place, and we know that it is not static or eternal. We have discovered that the universe is made up of millions of galaxies, each with billions of stars, and that is just our own Milky Way. We understand that the universe is not only expanding, but also that it was far from a static and eternal place when it began its existence one hundred years ago. We know that our Milky Way is just one galaxy in an immense sea of stars and galaxies. To think that we were so ignorant of the truth earlier this century is almost unbelievable.

Source: A Universe From Nothing: Why There Is Something Rather Than Nothing

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