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Evidence for the Big Bang

By: CharlieC 2014-08-21 16:11

I see that some people still don’t accept that the Big Bang happened so today I thought I’ll offer some evidence that will show that it did happen. I’m not going to list a whole lot of evidence; I’m only going to mention one. The reason why I’ve chosen this one is because everyone can see it for themselves, or rather what they don’t see but should.

So what don’t you see that should be visible? The answer to that are more stars. As everyone should know there are billions and billions of stars in the universe all of which emit light in the visible spectrum. I’m sure that most people have seen the Hubble Deep Field photos that show just how many stars are out there and it shows that their light is reaching us. So why does the night sky have so much black? If there are all these stars out there one would expect the night sky not to have any dark patches.

So what is happening and why is the night sky not a solid dome of star light? The answer to this question is motion. Due to the Doppler effect objects that move away from you will have a longer wavelength and lower frequency and objects moving toward you will have a shorter wavelength and therefore higher frequency. This is called redshift (away) and blueshift (towards).

Most of the billions of stars in the night sky have redshift. They have shifted so far that they are no longer visible with the naked eye (the frequency is to low). That would mean that all those stars are moving away from us. But if they are moving away from us it must mean that in the past they where a lot closer to us. Work that back far enough and you see that everything was at some time in the past all together at one point in space. This point in space is where it all began with the Big Bang.

I know this is not a full and comprehensive explanation but I hope that at lest when you look up into the sky at night you might find a new sense of wonder and understanding.      

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