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The Cosmic Background Radiation

March 20, 2008 on 2:05 am | In big bang |

This was the third and final piece of the puzzle that led to the acceptance of the Big Bang and the rejection of all alternatives: the discovery of the background radiation left over from the Big Bang.

The “leading theory” before this was discovered was the Steady-State theory. Sure, they knew of Hubble Expansion. But they hemmed and hawed and said, “well, the Universe is expanding, but there must be something that happens that keeps creating new matter for free, and that’s why the Universe can expand in a steady-state theory.” So, they made one thing up to explain that (which violates the conservation of energy, by the way). Then there were the light elements. They said, “Oh, well, since we make most of the heavy elements in stars, we can make the light ones, too, probably.” This was a young field, so they didn’t know that no, they couldn’t make that much helium that quickly.

But the Big Bang predicted leftover radiation. After all, if it was hot and dense, and all the Universe did was expand, then that radiation doesn’t just disappear, it sticks around, but evolves with the Universe, and becomes cold and diffuse. But they didn’t see it. Know why? It’s relatively faint, and you need a big antenna to see it. But a couple of guys from Bell Labs had a big antenna, and they were pointing it at different points in the sky. And they found there was this noise that you couldn’t get rid of, at about 3 Kelvin in Temperature. What the heck was it?

Well, their first guess was there was something dirty in the antenna. So they went up there, and it turned out it was filled with pigeon droppings.

So they cleaned it all out, and then looked again. Well, there was still all this noise! Everywhere in the sky! So they called up the smart guys at Princeton, who told them, “Oh-my-God you found the leftover radiation from the big bang!” So they got a Nobel Prize, and the guys from Princeton didn’t!

By chance, I met Arno Penzias (one of the two guys who found the leftover radiation) in Italy back in 2004, who told me most of this story. When they discovered this leftover radiation more than 40 years ago, people very quickly realized that the Big Bang was the only theory that explained this, the light elements, and the Hubble Expansion. That remains true to the present day. But one of the saddest stories is that of Fred Hoyle, who just couldn’t believe that his beautiful steady-state theory was wrong, and until his death in 2003, kept claiming, “We live in a fog,” referring to the cosmic microwave background as that mysterious fog.

Lesson? Learn from the evidence around you. And now you know all three reasons why the Big Bang is the only theory we have that explains why the Universe is the way it is!


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  1. LOVE the pic of the pigeon! I have to wonder now what your opinion is of string theory and the idea of a “multiverse”. Sorry, I’ve been reading Parallel Worlds by Michio Kaku and Endless Universe by Paul J. Steinhardt and Neil Turok. That’s just my humble mind’s automated response to these latest posts. :}

    Comment by Nipper — March 20, 2008 #

  2. […] loved his Steady-State Theory so much that he refused to accept the Big Bang, even when the evidence became overwhelming. And the evidence became overwhelming in 1964; Hoyle railed on against the Big Bang until his death […]

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