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When I shine a torch into the sky at night, where does the light end up?

I imagine some of the light will illuminate dust, and some of it hits stars and galaxies, but where does the rest of it go? Will it light up the edge of the universe, or does it simply redshift out into oblivion? If I hitched a lift with one of these photons of light, where would I end up?

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Categories: Our universe.

Tags: cosmology, photons, flashlight, torch.

 

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How many dimensions might there be?

Why do string theorists imply there are 11 dimensions?  Does that fall out of the math as an upper limit or is it just the minimum number of dimensions needed for the math to work out?   Could there be a much larger number of dimensions?

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Categories: Our universe.

Tags: cosmology, quantumphysics, Stringtheory.

 

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does entropy always increase?

A nigh homogenous state, a billion or so years post Big Bang came to form atoms...stars...all the systems we have today.

 

Is this not reduction of entropy?

 

If the speed of light = universal entropy, does this mean “we” our civilization is in the goldilocks zone of light-speed/entropy? Ordered enough to create all our varied matter and life, and disordered enough to allow light to travel at the required velocity for me to think this?A nigh homogenous state, a billion or so years post Big Bang came to form atoms...stars...all the systems we have today.

 

Is this not reduction of entropy?

 

If the speed of light = universal entropy, does this mean “we” our civilization is in the goldilocks zone of light-speed/entropy? Ordered enough to create all our varied matter and life, and disordered enough to allow light to travel at the required velocity for me to think this?

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Categories: Our universe.

Tags: Universe, cosmology, lightspeed, entropy, goldilocks.

 

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At the very end of the universe when only the very last hydrogen atom is left, what temprature will it be at before it expires?

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Categories: Our universe.

Tags: cosmology.

 

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when blackhole met white hole

What would happen if a black hole met a white hole? what would happen to them and would they actually come into contact with each other

Tiberius, Edinburgh (8yrs old)

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Categories: Our universe.

Tags: physics, cosmology, Blackholes, whiteholes.

 

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Black holse vs. White holes

What would happen if a black hole and a white hole met?

Tiberius, Edinburgh (8yrs)

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Categories: Our universe.

Tags: physics, cosmology, Blackholes, whiteholes.

 

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Could the rapid expansion phase of the universe explain the matter/anti-matter imbalance?

If the universe started out with a random distribution of matter and anti-matter, after they annhilate each other there would be some patches of matter and some of anti-matter left over. Then when the universe expands they would get seperated spatially from each other, allowing both forms of matter to remain in the universe.

 

Is this a possible scenario? Could there actually be anti-matter galaxies or galaxy clusters out there?

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Categories: Our universe.

Tags: physics, Universe, bigbang, cosmology, Expansion, anti-matter.

 

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Given matter-energy equivalence, matter cannot travel at c, so how can energy(light) travel at c?

In other words, light shouldn't travel at the speed of light.

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  • Asked by jiwasiw
  • on 2011-03-03 11:39:56
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Categories: Our universe.

Tags: cosmology, Speed-Of-Light, Universalweirdness.

 

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How do we know that the universe is isotropic and not, for example, fractal in its structure?

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Tags: physics, cosmology.

 

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When cosmologists talk of the early universe, what yardstick do they use to measure time?

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Tags: physics, cosmology.

 

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