So What Was the Big Bang

What caused the Big Bang? Who knows?

That is a question mostly outside the bounds of astronomy and physics. As scientists, we can only hope to understand things that are of this universe, and whatever caused the Big Bang is inherently unobservable.

Star Words

The cosmological principle is a cornerstone assumption about the nature of the universe. It holds that the universe exhibits two key properties: homogeneity (sameness of structure on the largest scales) and isotropy (it looks the same in all directions).

Star Words

The cosmological principle is a cornerstone assumption about the nature of the universe. It holds that the universe exhibits two key properties: homogeneity (sameness of structure on the largest scales) and isotropy (it looks the same in all directions).

Recall also from Chapter 22 that universal recession in time means the universe is expanding and that the concept of expansion implies an origin. Astronomers believe that at its origin, the universe was unimaginably dense. The universe was a point, with nothing outside the point. Ten to fifteen billion years ago, the entire universe exploded in the Big Bang, and the universe has been expanding ever since, cooling and coalescing into ever more organized states of matter. One very highly organized state of matter (you) is reading this book. Hubble's Law describes the rate of the expansion.

Telescopes Mastery

Telescopes Mastery

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

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