Questions tagged [universe]

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

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18
votes
1answer
3k views

What would the Universe be like if gravity was slightly stronger?

As the title says, what would the universe be like if the gravitational force was 0.1% stronger but the other forces (strong and weak nuclear forces, electromagnetic force) stayed the same? Would the ...
15
votes
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 ...
20
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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 ...
96
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26answers
30k views

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 ...
47
votes
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 ...
51
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10answers
4k views

Implications of Newtonian universe

I'd like to remove the speed of light limit from my world. However I don't want to just hand-wave the consequences. How should my universe look if: light travels at infinite speed, and so do gravity ...
18
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3answers
7k views

What would powers based on the four fundamental forces look like? [closed]

The four fundamental forces, those being Gravity, Electromagnetics, Strong Nuclear Force and Weak Nuclear force are said to be the forces that hold the universe together and so on. Based on that ...
9
votes
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
votes
2answers
7k views

What would happen to the universe if gravity became slightly stronger? [duplicate]

Almost the same as my other question but it isn't about how the universe would form. What would happen if to the universe if someone changed the strength of gravity by say 2%?
22
votes
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 ...
23
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4answers
2k views

A brief dip into the heat death of the universe

Setting: Modern Earth; technology no more advanced that what's reasonable within the next thirty years. Premise: A prehistoric (and broken) alien device is discovered on Earth, and researchers ...
7
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4answers
3k views

What if Newton's 1st law of motion is modified?

Newton's first law of motion states An object remains with the same velocity, or position of rest unless an external force is exerted. What if we created a hypothetical universe where An ...
6
votes
2answers
611 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 ...
6
votes
7answers
767 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 ...
5
votes
6answers
246 views

Brain connection in an alternative universe

In my alternative universe a race called "Reflections" are the counterpart of humans. They are a reflection, hence the name, of actual humans on earth. Each human has a reflection in this alternate ...
6
votes
3answers
326 views

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 ...
6
votes
5answers
751 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 ...
5
votes
4answers
315 views

Considering life to be a matter modifier - what would be the final state?

Imagine every organism is a matter-modifying and sorting mechanism within a very large chaos. Organisms believe their purpose is to evolve by reproduction and they're able to not wipe themselves out ...
-2
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2answers
2k views

If universe has an end/boundary, what else exists after the boundary? [closed]

I always wonder that if universe has a boundary to it then what else exits after it? or Does the universe has an end/boundary!!! What does exists after 100000 light years kilo meters distance? Am i ...