Questions tagged [universe]

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

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3answers
319 views

Could life in a planemo be sustained by cosmic background radiation?

I need to create a race that should be utterly older than humanity (and as such, much more powerful). My idea is to have that race originate from a rock planemo - a rogue planet, orbiting the center ...
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1answer
138 views

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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4answers
249 views

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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0answers
2k views

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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1answer
61 views

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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2answers
128 views

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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7answers
763 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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3answers
207 views

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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9answers
396 views

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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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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17answers
3k views

Lost in the multiverse: how to find home?

You have an individual who can travel backwards and forwards in time. They normally maintain an observer status but occasionally a butterfly is stepped on. Because, home is where the heart is, how ...
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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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2answers
292 views

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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4answers
586 views

Slowing the Heat Death of the Universe

I have an enormous civilization spanning a large amount of the universe. It is able to both travel and send information much faster than the speed of light without violating any laws of physics. ...
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8answers
6k views

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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14answers
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The universe is in a long, slow decline to darkness (the stars are going out) - What can we do about it?

The universe is in a long, slow decline to darkness Sorry folks but it's true, read the article! Here's a much edited-down version: The universe is cooling down, its stars pumping out about half ...
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2answers
336 views

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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4answers
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Consequences of a two-dimensional universe on cells and life

Suppose you have a 2+1 dimensional universe where the physics of that universe (we'll assume that the physics causes something similar to chemistry and that there is no gravity, but there is special ...
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2answers
149 views

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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7answers
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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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8answers
4k views

Universe where mathematics is different

There are many ways to conceive of a universe where physical constants are different to our own; however, what would the universe be like if mathematics itself were different? For instance, what ...
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4answers
577 views

Traveling Back in Time at the End of the Universe

Suppose humanity lives on for the next trillions upon trillions of years. One day we'll get to a point where no useful work can be done and hence no life can exist: the heat death of the universe. ...
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3answers
4k views

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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2answers
275 views

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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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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2answers
610 views

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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3answers
140 views

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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2answers
243 views

Cosmological consequences of a world with super-high refraction and atmosphere opaqueness

Disclaimer: the overall idea of the world as presented is basically lifted from Strugatsky Brothers "Inhabited Island". The details of the question are for a derivative work in that universe. Imagine ...
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5answers
6k views

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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5answers
243 views

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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26answers
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How to survive the heat death of the universe?

The eventual heat death of the universe is an awful time to be alive considering you wouldn't have long left after the last star finally fades away. In this scenario there is a small group of about a ...
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2answers
220 views

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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6answers
318 views

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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9answers
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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
3k views

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 ...
46
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17answers
8k views

What if we lived near a boundary of the universe?

This answer and its follow-up discussion with the OP made me think, and boil it down to the essentials: We live in a universe that’s either infinite in spacial extent or unbounded, and wrap-around ...
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10answers
4k views

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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2answers
262 views

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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9answers
3k views

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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5answers
2k views

Physical laws for a matter-filled universe

The Setting: I have an idea for a universe that, in an inversion to our own, is filled for the most part with matter in solid, liquid, gaseous or plasma form, while vacuum and degenerate matter is ...
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2answers
582 views

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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2answers
348 views

Cosmic Background Radiation in the past

I have a story where a species of the very first (literally first) carbon-based humanoid life (surprise!) that happen to emerge roughly seven billion years ago (their home system were formed twelve ...
9
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4answers
241 views

Could cosmic background radiation be used as a means of cataloging parallel universes?

In a situation where you have people traveling between parallel Earths, where they dropped in with little ability to tell which Earth they are on, could checking cosmic background radiation be a ...
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1answer
160 views

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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2answers
382 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 ...
3
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0answers
253 views

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
259 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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3answers
375 views

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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5answers
749 views

How can civilizations develop if the day keeps repeating forever?

Set in 2015, a highly classified experiment goes awry and as a result the entire universe including non-observable and all multiverses are trapped in an infinite time loop whereby each cycle lasts 24 ...
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3answers
264 views

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, ...