Questions tagged [universe]

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

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Moving galaxies to prevent them from passing the cosmic light horizon

Humans have become the leader of the Virgo Cluster faction, 800 billion years in the future. Our enemy factions are, the Fornax, Centaurus, and the Coma clusters, as well as a few dozen lesser ...
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In what sense is the physical world effectively described by mathematics?

I'm not sure whether this belongs here or in the Physics SE - please let me know if I'm mistaken! After reading Wigner's article on "The Unreasonable Effectiveness of Mathematics in the Natural ...
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Would categorizing planes of existence be considered dumbing down or enriching when it comes to worldbuilding?

The world that I'm making draws strong influence from a multitude of religions, mythology, and folklore, and that extends to the planes from occult beliefs. These planes are the Physical Plane, Astral ...
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When is the earliest that the Universe could support planets with long-lasting biospheres?

It took Earth ~ four billion years to go from molten rock to multicellular life. Let's take that as an absolute minimum requirement of time for organic life to evolve and produce sapient species (I ...
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What would happen if entropy works in reverse?

Entropy is the measure of how chaotic a system is analogous to a box containing many dices, the dices can be stacked properly together forming a cuboidal structure or scattered everywhere even outside ...
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In fictional world with two time dimensions could I still keep laws of thermodynamics as they are in modern physics? [closed]

There was this question about spacetime with two time dimensions here, but I wonder what could that mean particularly for thermodynamics? To be more precise, could such a universe (none of dimensions ...
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What unexplained or difficult to explain phenomena in our universe could be used to power magic in a parallel universe?

In the land of the Kahvoren the Entrancement of Genud Before Repentance dance to the ancient tunes of frenzy and death. With cries splitting the sky the Kahvoren circle the Chosen, the noble born bred ...
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Octahedral universe and its benefits?

I am creating a Space opera which involves highly advanced civilizations spreading throughout the universe to build the largest empires that they can. Dense supercluster nodes are areas which the most ...
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Universal Time | Time in Space seen by Intelligent Life Forms or Aliens [duplicate]

How would several intelligent life forms, aka. Aliens or Foreigners to us, who roam around space (in something I would call space ships) and have never seen or heard about earth interpret time? How ...
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252 views

Universe without Gravity

Imagine a theoretical parallel universe that does not have and never had a gravitational force. Loose hydrogen atoms would still have formed, and in some cases might have formed H2, but would not ...
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What are the most interesting phenomena we will have in a universe where the speed of light is very slow or much faster? [closed]

Let's say we have cloned our universe and created the Slow-Universe and the Fast-Universe. Everything is the same except that: In the Slow-Universe, the speed of light is the same as the speed of ...
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Additional energy / matter from parallel universes

If our universe was a zero-energy universe, what would happen if someone would transfer energy / matter or bring objects from parallel universes to our universe? What would be the consequences?
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Possibility to prolong half life of unstable molecules through altered strong force constant in parallel universes?

This continues my previous multiverse-related questions. There are some particles that could be useful to the scientific industry if they did not decay so quickly, such as antimatter-matter composites,...
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How in general would molecular structures and interactions change if leptons were heavier or lighter than they should?

Continuing on with my questions regarding multiverses, I have observed in most theories that at least, the physical constants between universes would have changed. So parallel universes could have ...
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Why would the most energy efficient shape be a cube instead of a sphere?

The most energy efficient shape in our universe is a sphere. However, in another universe it is a cube. Why and how would this happen? I came across this idea while thinking about Minecraft and why ...
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Can alternate universes (under Greene's Nine Multiverses Theory) exist with different matter and physics? [closed]

So, it is clear I was not clear enough with the previous thing about "handwavium", so I will try this question again and be more frank. Although, the main subject has changed to an extent. What I was ...
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How would a higher-dimensional being enter a lower dimension?

So I could not get any answers for my previous question regarding what happens in a indeterministic world such as the worlds in a Cauchy Horizon of a Reissner Nördstrom Black Hole. However, I ...
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Can my advanced civilization halt the expansion of the universe?

Do the laws of physics permit any chance for a Type III civilization on the Kardashev scale to halt or even reverse the expansion of the universe, or bring the galaxies back closer together, assuming ...
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Different human-survivable universes

If humans had the ability to physically travel to a universe similar to our own, how different could its fundamental constants be and still allow humans and other terran life to survive there long-...
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When universes collide

Let us suppose that we have a system of multiverses, each universe within the multiverse existing as a higher-dimensional hyperspherical bubble within the yet higher-dimensional multiverse. There ...
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How would a Universal Coordinate system work?

We have a variety of ways of describing our location here on Earth. We can refer to a nearby landmark (eg "by the City Hall"), we can describe our location relative to an area (eg "in the South of ...
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A “time capsule” that can last for trillions of years?

The universe is dying because it has exhausted nearly all of its resources. Humans became the last species in the universe because of their resilience and sheer willpower. And yet, humanity still ...
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How could you wipe out all life from the universe? [closed]

If you had as many resources as you needed, obviously making A LOT of assumptions about physics, how could you semi-realistically kill all living creatures in the universe?
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Naming parallel universes

In a parallel universe system (previously discussed here and here), portals are mechanical door frames that, when activated, cause a copy of your universe to appear on the other side. You and your ...
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How would roads and buildings be constructed if universe does not allow parallel lines? [closed]

Imagine we are living in a parallel universe where the parallel lines can only exists as imaginary lines just not in the real physical world, how would road and skyscrapers work in such a universe?
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What’s the difference between inter-dimensional, inter-universal, and extra dimensional beings? [closed]

Recently, I’ve grown curious other universes and dimensions, and while looking around and reading about said things, I’ve come across the terms inter/ extra dimensions and universes. This got me ...
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When will the last white dwarfs become black dwarfs?

I want my planet to be the last planet in a universe to host life forms. I expect a rough estimation as answer. Thanks.
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Would humanity go extinct if suddenly a parallel magnetic field of 1T fills the entire universe?

Imagine one day the universe becomes a bar magnet except all the line of force are running in parallel and the magnetic flux density is 1 tesla throughout, could this be a doomsday scenario for us? ...
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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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995 views

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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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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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 ...