Quote:
Originally Posted by Rotawee
Space is nothing. Nothing cannot expand.
And I really hate this statement (3). It cannot be proven. I like to fight it by saying there are only about 6000 stars in our sky on a nice night and more grains of sand than that in my hand (topic usually comes up on a beach naturally) And when they say universe I remind them about sand dunes, deserts, mountains, the bottom of the ocean, etc etc. I'm a firm believer that there really isn't more stars in the universe than grains of sand on our planet.
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Next time you are outside during a full moon on a clear night, observe the size of the moon when it is overhead. Now look at a small region in the sky that is 1/10 of the size of the moon. You see nothing, not a single star in that region.
Now call up your friend Hubble Telescope, he is watching that same 1/10 section of the sky also. This is what he sees:
In that tiny region of the sky, 1/10 the size of the moon, there are about 10,000 galaxies. The average galaxy has about 150,000,000,000 stars. The entire sky is about 12,000,000 times larger than 1/10 the size of the moon. So a rough estimate of the number of stars in the observable universe is...
10,000*150,000,000,000*12,000,000 = 18,000,000,000,000,000,000,000 stars