Questions tagged [universe]

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

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What would be more realistic for a universe where FTL is possible?

I am working on my own project with applying science to Star Wars. I try to meld the fantasy with as much real science as possible, but I am having a problem with the size of the universe. I am ...
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7 votes
4 answers
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Could neutron star mergers provide the necessary elements for complex life in the early universe?

I have been looking into the earliest possible time in the universe that a human-like intelligent species could evolve based on the necessary elements being present. Kepler-444 is one of the oldest ...
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4 votes
2 answers
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Understanding the universe as a 3-dimensional surface

When thinking about the shape of the universe in my story I have been looking into it being a 3-manifold. As I understand it, space would be a 3-dimensional surface and for a small scale observer ...
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5 votes
3 answers
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How would future galactic civilizations deal with the Big Rip? Could they escape it or hide anywhere, like inside black holes? [closed]

Humans colonized all the stars in the Milky Way in the first million years. In the next 200 million years they conquered all the planets in the Local Group. In the next few billion they conquered all ...
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7 answers
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How can daemonic pacts made across different realities be honored?

Our world orders the immaterial realm, a place in which daemons and otherworldly creatures reside. These separate realms have their own rules governing their realities, such as gravity, physics, and ...
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1 vote
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Technological Framework that could Hasten the End of the Universe

A while ago I read what was supposedly the original plan for the ending of Mass Effect. In the world of Mass Effect, there is a specific technology that underpins essentially the entire culture and ...
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2 votes
1 answer
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Future limits detecting the Cosmic Microwave Background (CMB)

I am working on a part of my story where a long-lived civilization is deciphering information in the cosmic microwave background (CMB). I have read that in the future as distant CMB light reaches us, ...
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-4 votes
2 answers
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Reasons why a sentient universe would create life? [closed]

The basic idea I had was that the universe basically thought itself into being and from there decided to create life. It sent out the seeds for life to begin, then created a race to watch over things. ...
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6 votes
3 answers
527 views

Will a Universal Ocean Prolong the Age of Stars for Eternity?

One moment, there are as much as two trillion different universes, all of which have their own collections of galaxies. The next, 4,543,000 universes still have their galaxy collections. What ...
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Write short stories before your main story to help the worldbuilding process

Is it good worldbuilding practice to write short stories happening in your universe to set a precedent to how your world works and how the common and always unseen characters would find their way ...
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5 answers
176 views

What motives would an omnipotent being have for ruining a universe it created? [closed]

Background In a fantasy world I am working on, the universe was created by an omnipotent (but not omnipresent or omniscient) entity known as the Storyteller. Inside this new universe the Storyteller ...
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2 answers
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Is it possible for a future civilization to concentrate the galaxies (or some of them) of the universe?

In the world I describe there is not much time left before the expansion of space takes its toll. Galaxies are already accelerating away from each other on a negatively curved spacetime. The expansion ...
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1 vote
2 answers
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Effect of adding a fourth kind of radioactive decay

That question did spawn from though experiments about what kind of differences one had to expect in a parallel universe. When reading in fiction about this topic, sometimes the "changed natural ...
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9 votes
11 answers
2k views

What would be some ways to balance energy/mass from a parallel universe to another when someone - or something - travels through a wormhole into it?

Conservation of energy is a "universal" law, and would be counterintuitive to have someone travelling from a universe like ours - with our physics framework - into another universe that ...
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7 votes
3 answers
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Seeking good physical candidates for total collapse of the universe we live in

Bringing this question over from Physics SE where it was closed: I'm looking for an 'as close to our understanding of current physics' doomsday scenario that results from something about the physics ...
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14 votes
5 answers
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Is the universe old enough to have an ecosystem of feral self-replicating spacecraft?

Is it possible that, through any plausible history of alien life, and any plausible method of propogation for a self-replicating spacecraft, that the universe, as seen from present day Earth, could be ...
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1 vote
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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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4 votes
2 answers
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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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7 votes
1 answer
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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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3 votes
3 answers
283 views

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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3 votes
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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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1 vote
1 answer
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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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6 votes
4 answers
360 views

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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0 votes
2 answers
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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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2 votes
3 answers
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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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3 votes
0 answers
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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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4 votes
2 answers
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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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3 votes
4 answers
336 views

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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1 vote
1 answer
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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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4 votes
3 answers
886 views

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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2 votes
1 answer
114 views

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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12 votes
9 answers
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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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6 votes
2 answers
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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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6 votes
2 answers
285 views

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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5 votes
1 answer
204 views

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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5 votes
2 answers
213 views

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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10 votes
5 answers
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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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4 votes
4 answers
169 views

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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13 votes
17 answers
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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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2 votes
3 answers
233 views

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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6 votes
2 answers
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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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3 votes
1 answer
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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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4 votes
4 answers
320 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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0 votes
1 answer
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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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2 votes
2 answers
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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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6 votes
3 answers
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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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2 votes
10 answers
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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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57 votes
12 answers
13k views

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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5 votes
2 answers
679 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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