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Q&A

Posts tagged universe

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Q&A How long will it be until the cosmic microwave background is undetectable?

I've had a number of interesting conversations with people about how the cosmic microwave background (CMB) will evolve in the future. The CMB is the sea of photons left over from the epoch of recom...

0 answers  ·  posted 2y ago by HDE 226868‭  ·  edited 2y ago by HDE 226868‭

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Q&A What would a hard boundary mean in physics on the quantum-mechanical level?

In this question I asked about the possibilities of what a boundary might be like, with emphasis on the storytelling. Now I'd like to investigate what a hard boundary would mean in quantum mechani...

1 answer  ·  posted 7y ago by JDługosz‭  ·  edited 2y ago by HDE 226868‭

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Q&A 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...

2 answers  ·  posted 2y ago by Jimmery‭  ·  last activity 2y ago by Jimmery‭

Question universe
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Q&A 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...

5 answers  ·  posted 2y ago by In the name of the story‭  ·  last activity 2y ago by In the name of the story‭

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Q&A 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 cente...

3 answers  ·  posted 7y ago by Jorge Aldo‭  ·  last activity 3y ago by Jorge Aldo‭

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Q&A 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.

1 answer  ·  posted 3y ago by justthisonequestion‭  ·  last activity 3y ago by justthisonequestion‭

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Q&A 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 ...

0 answers  ·  posted 3y ago by HDE 226868‭  ·  last activity 3y ago by HDE 226868‭

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Q&A 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 u...

7 answers  ·  posted 3y ago by Gilad M‭  ·  last activity 3y ago by Gilad M‭

Question universe
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Q&A 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 ab...

3 answers  ·  posted 3y ago by overlord - Reinstate Monica‭  ·  last activity 3y ago by overlord - Reinstate Monica‭

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Q&A 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...

12 answers  ·  posted 3y ago by theonlygusti‭  ·  last activity 3y ago by theonlygusti‭

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Q&A 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 interst...

2 answers  ·  posted 3y ago by Renan‭  ·  last activity 3y ago by Renan‭

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Q&A 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. Re...

4 answers  ·  posted 7y ago by Clothlen‭  ·  last activity 3y ago by Clothlen‭

Question physics universe
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Q&A 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 h...

14 answers  ·  posted 7y ago by chasly from UK‭  ·  last activity 3y ago by chasly from UK‭

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Q&A 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 uni...

2 answers  ·  posted 3y ago by Logan R. Kearsley‭  ·  last activity 3y ago by Logan R. Kearsley‭

Question physics universe
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Q&A 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 specia...

4 answers  ·  posted 7y ago by god of llamas‭  ·  last activity 3y ago by god of llamas‭

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Q&A 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 manifes...

3 answers  ·  posted 3y ago by chasly from UK‭  ·  last activity 3y ago by chasly from UK‭

Question universe
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Q&A 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 p...

3 answers  ·  posted 4y ago by Aizen-sama‭  ·  last activity 4y ago by Aizen-sama‭

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Q&A 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 c...

2 answers  ·  posted 4y ago by Aizen-sama‭  ·  last activity 4y ago by Aizen-sama‭

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Q&A 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. Imag...

2 answers  ·  posted 8y ago by DVK‭  ·  last activity 4y ago by DVK‭

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Q&A 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-righ...

5 answers  ·  posted 4y ago by Fabian R&#xF6;ling‭  ·  last activity 4y ago by Fabian R&#xF6;ling‭

Question physics universe
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Q&A 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...

26 answers  ·  posted 7y ago by Gorp‭  ·  last activity 4y ago by Gorp‭

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Q&A 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 everyon...

6 answers  ·  posted 4y ago by Len‭  ·  last activity 4y ago by Len‭

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Q&A 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 even...

9 answers  ·  posted 4y ago by nuckingfutz ‭  ·  last activity 4y ago by nuckingfutz ‭

Question space universe
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Q&A 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 har...

10 answers  ·  posted 4y ago by amflare‭  ·  last activity 4y ago by amflare‭

Question physics universe
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Q&A 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...

5 answers  ·  posted 8y ago by Monty Wild‭  ·  last activity 4y ago by Monty Wild‭

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Q&A 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...

2 answers  ·  posted 7y ago by Hendrik Lie‭  ·  last activity 4y ago by Hendrik Lie‭

Question physics universe
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Q&A 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 conundru...

3 answers  ·  posted 5y ago by Justin Thyme‭  ·  last activity 5y ago by Justin Thyme‭

Question universe energy
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Q&A 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 mea...

4 answers  ·  posted 5y ago by Tagadac‭  ·  last activity 5y ago by Tagadac‭

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Q&A 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 ...

2 answers  ·  posted 5y ago by SovereignSun‭  ·  last activity 5y ago by SovereignSun‭

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Q&A 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 e...

1 answer  ·  posted 5y ago by SovereignSun‭  ·  last activity 5y ago by SovereignSun‭

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Q&A 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 univers...

2 answers  ·  posted 5y ago by SOFe‭  ·  last activity 5y ago by SOFe‭

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Q&A Entropy of the afterlife

My world is based on the concept of afterlife, with a twist: people who died in other worlds are resurrecting in mine. Once in the afterlife world if they suffer another lethal injury or condition ...

3 answers  ·  posted 6y ago by Zoltán Schmidt‭  ·  last activity 6y ago by Zoltán Schmidt‭

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Q&A 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 A...

4 answers  ·  posted 7y ago by ghosts_in_the_code‭  ·  last activity 6y ago by ghosts_in_the_code‭

Question physics universe
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Q&A Material for container that survived the Big Bang

I read a novel that mentioned about a past civilization before the Big Bang. They predicted such phenomenon would happen some day, and to preserve their species and recreate their population after ...

5 answers  ·  posted 6y ago by SOFe‭  ·  last activity 6y ago by SOFe‭

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Q&A universe with infinite energy

In our universe infinite energy is not possible, at least given the known laws of physics. But in another universe what would allow for energy to be in the same amount as space? But how large i...

4 answers  ·  posted 6y ago by Charon‭  ·  last activity 6y ago by Charon‭

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Q&A Can you just wait out the heat death of the universe?

Okay, so the heat death of the universe is approaching. You can't stop it. You can't dodge it. What do you do? You wait it out. According to wikipedia, about $10^{{10}^{56}}$ years after the heat ...

5 answers  ·  posted 6y ago by PyRulez‭  ·  last activity 6y ago by PyRulez‭

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Q&A Parallel universes, mirrored

My question regards mirroring, specifically what you would expect from a universe that was mirrored from the perspective of our own, regarding its interactions with our own. The mirroring works exa...

3 answers  ·  posted 7y ago by Vakus Drake‭  ·  last activity 6y ago by Vakus Drake‭

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Q&A 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 grav...

10 answers  ·  posted 6y ago by Tomáš Zato - Reinstate Monica‭  ·  last activity 6y ago by Tomáš Zato - Reinstate Monica‭

Question space universe
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Q&A 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 det...

4 answers  ·  posted 6y ago by Liesmith‭  ·  last activity 6y ago by Liesmith‭

Question space universe
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Q&A How would a civilization similar to earth develop if there were no stars at night?

Stars and constellations have been for many civilizations,sources of wonder and mystery. We look at the stars so much, that we found patterns and shapes in the stars, and used them as guidance duri...

2 answers  ·  posted 7y ago by Dupontrocks11‭  ·  last activity 7y ago by Dupontrocks11‭

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Q&A 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 ...

4 answers  ·  posted 7y ago by RienNeVaPluÍ¢s‭  ·  last activity 7y ago by RienNeVaPluÍ¢s‭

Question biology universe
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Q&A Repulsive Universe

Gravity in our universe is an attractive force between bodies with mass [citation needed]. This allows matter to coalesce and form all the large scale structures we observe - planets, stars, galaxi...

3 answers  ·  posted 7y ago by System‭  ·  last activity 7y ago by System‭

Question physics universe
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Q&A Taming wormholes

An ancient civilization mapped wormholes when the universe was quite young and smaller. This allowed them to reach other galaxies (wormholes from our galaxy to others). They mapped it all. Humans ...

2 answers  ·  posted 7y ago by Jorge Aldo‭  ·  last activity 7y ago by Jorge Aldo‭

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Q&A Small universe - is there any point in interstellar communication?

Everything on Earth and in the Solar system is as we know it. However it is discovered that we live in a small but unbounded universe. That is to say if we travel far enough in a straight line we w...

4 answers  ·  posted 7y ago by chasly from UK‭  ·  last activity 7y ago by chasly from UK‭

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Q&A Alien exploration : drone digging earth crust

I was thinking of potential planet explorations, by extremely advanced alien species, through automated drones (or "flying laboratories") scanning and analyzing the planets. (By "extremely advanced...

5 answers  ·  posted 7y ago by Strannch‭  ·  last activity 7y ago by Strannch‭

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Q&A 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 t...

1 answer  ·  posted 8y ago by Beta Decay‭  ·  last activity 7y ago by Beta Decay‭

Question gravity universe