Big Bang in a Rain-Lashed Tent
Pale Blue Pod
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Is the Big Bang Theory True?
In 1929, Edwin Hubble measured the distances to far away in nebulae. He was also calculating how fast those galaxies were moving. So based on that, he concluded that the universe is expanding. But what about this idea that the universe was much more compact in earlier times? Well, for that, we look to the discovery from the 1960s of the cosmic microwave background or the CMB. This shows us the teeny tiny fluctuations in temperature from a moment pretty soon after the Big Bang. It's actually like 400,000 years after the Big bang. That is pretty soon, trust me, on these cosmic scales. And because we can see how the temperature was distributed, we can
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