Questions tagged [universe]

Concerning the entire universe, the universe itself, and alternate or parallel universes.

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What would an object made from photon matter look like? [closed]

In this article,two photons have been made as to interact with each other. So assuming we managed to make, lets say, a meter by meter cube out of photon molecules that is stable, how would it: A) ...
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Finding magic by repeating an experiment over a magical limit of the universe

Definition: Scientific laws or laws of science are statements that describe or predict a range of natural phenomena. A scientific law is a statement based on repeated experiments or observations that ...
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How Likely is a Planet Made Almost Entirely of Metals?

For this question, the word 'metals' does not refer to elements heavier than hydrogen and helium. It instead refers to metals as defined by the periodic table of elements. After researching the ...
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10answers
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Worlds with different mathematics and logic [closed]

I want to visualize how worlds with different mathematics and logic could function, as opposed to worlds with different physical laws. For instance, I came up with the following examples. A world ...
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12answers
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If every star in the universe except the Sun were destroyed, would we die?

If every star and planetary system and blackhole—all mass (not sure whether to include dark matter or not) except what directly makes up our solar system—in the Universe except the Sun were wiped from ...
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What would happen if the Earth passed through an interstellar dust cloud?

I understand an interstellar dust cloud as "an accumulation of gas, plasma, and dust in our and other galaxies. Put differently, an interstellar cloud is a denser-than-average region of the ...
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9answers
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How can I create an infinite space bound by another infinite space (or contained within it)?

First let me preface by saying this question will be very math heavy, and might be as equally suited to math stack exchange as world building. For that I apologize, but since the reason for my ...
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Parallel universe portals: an infinite hall of mirrors?

Parallel-Universe Portals A solid material has been discovered that, when shaped into a ring and activated (by lowering its temperature below some critical point, let's say), it forms a parallel ...
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What does it actually mean to have two time dimensions?

The trivial answer is that it just means "you have two dimensions with inverted sign in your spacetime metric". But the perceptual result of that kind of choice doesn't actually look qualitatively ...
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A universe without light?

In the story Wang's Carpets (and part of the novel Diaspora), Greg Egan sketchily describes a high-dimensional universe which contains no analog for light, such that the aliens who inhabit this ...
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Could we become the universe? [closed]

First question ever here. This is not my first language so sorry for any mistake. How could a species become the Universe itself, as in controlling every single particle and permeating every form of ...
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Is it possible to have the age of the universe be unknown?

I’m making a fictional galaxy, and I want the inhabitants of this galaxy to be unable to calculate the age of the universe, I want them to be unaware of how much has already happened. I’ve already ...
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How soon can the first stars form?

Introduction In our universe, the cosmic microwave background was formed approximately 400,000 years after the Big Bang. It was hot, but within a few million years after the Big Bang, it would no ...
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The One-Electron Universe postulate is true - what simple change can I make to change the whole universe?

The one-electron universe postulate, proposed by John Wheeler in a telephone call to Richard Feynman in the spring of 1940, hypothesises that all electrons and positrons are actually ...
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If the universe turns out to be infinite does that mean that the multiverse isn't real? [closed]

Let's say that scientists somehow discover that the universe is infinite. In particular, they say that after the big bang, the universe expanded everywhere. In that case, if the universe is infinite ...
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3answers
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How could a creator develop from pure energy to a conscious all knowing being [closed]

Let's assume the purpose of life is to reproduce to survive and on the quantum level for sub atomic particles to bond for longevity. Could an unknown force of energy throughout the ages of time ...
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What would it look like in the accretion disk of a feeding supermassive black hole?

I wanted two characters unaffected by the heat and gravity to be close to a super massive black hole within the accretion disk, at times moving in orbit and at times completely still. Stars and ...
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How close could a planet get to a super massive black hole before being destroyed

I wanted to create a scene where two god-like characters are talking or fighting on a planet or fragment of planet to which they've teleported that's about to be obliterated by a black hole. The ...
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How to detect that the universe got mirrored?

This might be more fit in physicsSE, but since I don't even know if my premise is physically sound, I'll post it here. One day, something caused the universe to get mirrored, meaning a left-right ...
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How can I prevent planeswalkers from organizing into an army? [closed]

A demigods is a human who is born with a divine spark. When this spark is activated, the individual becomes a being with incredible power. It grants them a number of abilities, including immortality, ...
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Can a planet with chaotic rotation have more than one ring rotating in differents axis? [duplicate]

Let's say that planet earth have a big explosion . An explosion generated in earth big enough to change the planet shape. Making earth having a chaotic rotation like Hyperion leaving water and rocks ...
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What would shake a galaxy and what would shake the universe?

I'm trying to think of what kind of cosmic event would cause an explosion powerful enough to "shake" or disrupt the whole flow of a galaxy and on that same note what other kind of super cosmic event ...
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7answers
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Travelling the multiverse by accident? [closed]

As you've probably guessed, I have no idea how multiverses and parallel universes, or space-time travel, etc work. I don't know how Physics or Mathematics explains alternate universes. But, they are ...
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How to start a giant war that no one can stop? [closed]

I want to create a giant war, called the 10,000 War. This war becomes so big entire civilizations get wiped out, and no one can stop it, though everyone wants to. The war cumulated to become bigger ...
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How small can the universe be while still appearing infinite?

I'm working on a concept of universe creation. The best way to describe it in a sentence is the Judeo-Christian Creation Story but from God's point of view. My question is, staying as close to hard-...
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How to justify that people forgot the past and that they have neighbours?

Let's say that there are 2 countries with very different inhabitants. Country A has no idea that country B exists. Country B may or may not know about Country A. Country A is surrounded by large ...
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Can our brain access other dimensions/universes? [closed]

Following the Multiverse theory and a possibility that multiverses do not differ much when compared with one another, can we explain a person accessing thoughts or vision from a different multiverse? ...
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considering the universe is 13.8 billion years old aprox. how is likely that an alien civilization is more advanced than us? [closed]

considering the universe is 13.8 billion years old aprox. how can a civilization be even more advanced than us if we both lived the same amount of time since the universe was born?. i mean what could ...
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6answers
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How could it be possible for an entire region of space to be filled with Earth like planets?

Ok, I get it, me dumb, you smart. Only smart questions allowed. In any case I'm going to leave the question unaltered in case some others might get something out of the answers. Thanks to everyone ...
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2answers
373 views

What would a world be like with cross dimensional contact? [closed]

A universe of 10 dimensions I'm trying to build a universe with interactions between beings from different dimensions. Only dimensions 3 and up would be capable of spawning any sort of life. The most ...
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Physical laws for a multiverse with white holes? [closed]

My fictional worlds reside in a multiverse. More specifically, they reside in a universe within that multiverse that is very similar to ours. But here are some big differences: White holes are in ...
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3answers
257 views

How everything will act in a world of two time dimensions? [closed]

As far as we know , we live in a universe with only a single dimension of time, we know that some events happens BEFORE or AFTER other events , we know that some events happens slower or faster then ...
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What happens to humanity if every star goes nova simultaneously?

I'm working with a plot whose backstory involves two alternate timelines colliding with one another. Our solar system is spared the worst of the side effects due to half of the mass of each version of ...
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How to reduce demagogues' influence on the universe literally shaped by people's beliefs?

The laws of the Universe are not set in stone. Impossible does not exist. Everything, absolutely everything, is possible given that enough people believe in it. Centuries ago magic was as real as ...
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315 views

“Alternate background colors”

A level IV parallel universe is a universe that may have different laws of nature than our own, but still work out to be mathematically true. I'm thinking about a level IV parallel universe where, ...
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What objects can be found in the universe when all the stars are gone? [closed]

Far in the future, in a termic death of the universe scenario, what objects are still around to see? Will planets still be around, gas clouds, black holes, star remnants? Any other new or old types ...
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What would entropy look like in an infinite number of universes?

There was a question recently about gatekeepers controlling the flow of goods between universes. The gatekeepers became a religious order. The premise got me thinking, and I have come to a conundrum ...
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Size of the “Monster Hunter” planet

Imagine a world in which you have all the creatures from the game franchise "Monster Hunter"... Screenshot from the upcoming Monster Hunter World game ...and when I say all the creatures I mean ...
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Could you suspend your disbelief if I explain the oddities of quantum physics as a simulated universe with reduced dimensions? [closed]

A visitor claiming to be from outside our universe has come to our world illegally to push forward her academic project (a simulation that happens to be our universe) before it get's shut down. ...
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Variability in Alternate Universes [closed]

Lets assume that the Multiverse Theory is true. Now lets talk about a Kardashev Type III Civilization living in one of these parallel universes. For the sake of the argument, lets assume that this ...
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2answers
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How are the directions on a planet defined? [closed]

How are the directions on a planet determined? Is it based on sunrise, if the sun rises in the east? Or is it based on magnetic north? I would like to know about directions for planets which may have ...
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Can the universes that make up the multiverse and alternate realities exist as 2 separate entities? [closed]

To try and clarify: A multiverse can contain many different universes with varying laws of physics, and is usually depicted as bubbles (universes) bouncing around in the multiverse. On the other hand, ...
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Travelling through a black hole like through a wormhole?

To add to my previous question. Can a black hole be a wormhole or can a wormhole exist within a black hole? The result I want to get is this: You enter a black hole in one part of space and exit from ...
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1answer
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What could lead to the appearance of a wormhole relatively close to our planet?

I was thinking of different ways a wormhole could appear relatively close to our planet but even reading much about wormholes I can't think of any possible conditions. I need some theoretical or even ...
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Viability of a Dyson Universe? [closed]

So going beyond the idea of a Dyson Sphere where could a Dyson Universe be possible? The Idea of a Dyson Universe is like a Dyson sphere with massive celestial engineering and construction in the ...
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Size of the universe, zipped

Compressed archives in computer science are, from some perspective, decreasing the data size by minimizing repetition of data. Take each particle (to any precision you prefer) in the whole universe, ...
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How to prove that the solar system isn't inside of a localized physics bubble? [closed]

So, let's say that somewere out past the Oort Cloud, physics just kind of... changes. For whatever reason. Maybe space is magic, or maybe we're just in a weird sort of localized physics bubble. The ...
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Can Brian Greene's Ultimate Multiverse contain Cthulhu Mythos?

I'm wondering if Greene's Ultimate Multiverse could work like Heinlein's World as Myth concept or Stephen King's Dark Tower. 'Work' in a way that it could contain fictional universes. In this case, ...
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How does a community of a Universe Simulator have the same language as its creator? [closed]

This takes place in the optimistic future. While a war general is strategizing his plans of attack, he rejects using outdated war games of the past, and instead tasks a few members of his team to ...
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What would be the “scientific” explanation for having memories from a parallel universe?

This world is like ours but time travel is possible. The character and others have made time travelling in their past to change things but did not think about the consequences, so they created ...