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The universe is estimated to be around 13.8 billion years old in 2023.

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3mo ago

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If a light beam travels for the entire lifetime of the universe how far does it go?

A light beam that travels for the entire lifetime of the universe would cover a distance of approximately 13.8 billion light-years. This is because the observable universe is estimated to be about 13.8 billion years old in terms of light-travel distance.


How old is light energy?

The light that is now coming to us in the cosmic microwave background radiation was released in an event called "Recombination," which occurred about 377,000 years after The Big Bang, which occurred about 13.7 billion years ago. Thus, for SOME light beams we detect today, our Universe is about 13.7 billion years old.


What if you put the universe in a tube?

There seems little point in trying to answer the question " what will happen if we do this ?" unless we first ask "could we do this ?" and get a positive answer. It is fairly obvious that trying to put the universe in a tube would pose some major engineering difficulties, but the real problem is philosophical. The universe is everything. The whole of space, and the whole of the matter and energy that is in that space. If we try to put the universe in a tube, where would we get the material to make the tube, and where can we find the space to put it in ? The old, old problem of how you lift yourself by your own bootstraps pales by comparison.


Is the universe expanding or contracting?

The universe is expanding.


What are the implications of a dodecahedral universe on our understanding of the cosmos?

A dodecahedral universe would suggest that the universe is finite and has a specific shape, which could challenge the current understanding of an infinite and unbounded universe. This could lead to new insights into the structure and geometry of the cosmos, potentially changing our understanding of how the universe functions and evolves.