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Questions tagged [earth]

For questions about planet Earth as we know it. Changed Earths (extra moon, closer solar orbit, etc) should use the [earth-like] tag.

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2answers
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What would be the mathematical formula to figure out a person's weight on a world bigger or smaller than Earth?

Okay, trying to figure out this math guys! This may be simple math to some of you, but not me!!! I googled various ways of asking this question and got some good results, but I'm looking for a simple ...
5
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5answers
2k views

What natural event could strip all of Earth atmosphere?

I was reading up on Mars thin atmosphere and was wondering how could Earth becomes like the red planet except it only has only 100 pascal (air pressure) at imaginary sea level? Mars is 600 pascal on ...
2
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2answers
99 views

Earth Time Periods: Choosing for a hidden lair in time [closed]

You are a former nuclear scientist who has researched in the field of fusion, who is in possession of a device that once activated will create a two-way portal into any time period on Earth. The time-...
7
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1answer
197 views

Can fiber optic cables be used to pipe sunlight into an underground bunker for growing plants?

One major problem with living underground is you lose all of that wonderful energy provided by the sun. This energy is useful for many things including growing plants for food. A window is effectively ...
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3answers
160 views

What amount of heat would be necessary to evaporate the oceans? Can his heat threshold be reached if there were no ozone layer? [closed]

The problem in my fictional future Earth was: almost the entire ozone layer disappeared due to a massive release of CFCs in the atmosphere. I was trying to calculate if this would lead to the oceans ...
7
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1answer
81 views

How much does the ecosphere weigh?

So, we've gone off to another star system and decided to build a Dyson bubble--a continuous statite, supported by radiation pressure, surrounding a star--with a surface gravity of 1g to live on. Now, ...
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1answer
153 views

What would be possible reasons for Russia splitting into East and West? [closed]

I'm designing an alternate history that centers around an event known as the 'Russian Separation War', where Russia splits into two halves, East and West. EDIT: This is based in modern times (i.e. ...
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6answers
268 views

Creating flying cities

Writing about suspended cities within a planet's atmosphere! The story itself focuses on the air forces that fight for each of the hundreds of floating city states living in the sky, but that's here ...
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2answers
101 views

If a new planet was discovered & became a spot of constant tourism, would that decrease car pollution and give the earth's climate time to heal [closed]

if a new planet was discovered and it was possible to live there and was not too far from earth, and after it was made suitable for human life and so on and became a spot of constant tourism, would ...
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5answers
157 views

Mechanism for high geographical change but not killing everything

Premise: Earth has a magical cataclysm that pulls up new mountains, pushes down parts of landmasses, and generally reshapes Europe enough to make it unrecognizable (to the average person looking at a ...
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0answers
66 views

Why would somebody want to stop the four elements? [closed]

I'm writing a story about the four elements that are in four people. One controls water, one controls fire, and so on for air and earth. Why would the antagonist want to get rid of the four people/...
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3answers
139 views

How to cross the Earth's core in a straight line

My superhero generates a force field which lets him and his equipment sustain the extreme conditions found inside the Earth. He decides to travel from the Geographic North Pole to the Geographic South ...
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2answers
144 views

A sudden decrease of gravity on Earth [closed]

I have an idea about a story where gravity suddenly changed and became about 10-20% weaker (lower). Humanity now needs to adapt to the new situation. What disasters and catastrophes would this sudden ...
13
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10answers
4k views

If this earth were cube shaped would it be possible during Magellanic era using a float ship to figure out that the earth is cube shaped?

If this earth were cubed shape would it be possible for Magellan to prove that the earth is cube-shaped without going to space and looking at earth? It might seem strange to think that earth might be ...
5
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3answers
383 views

How many people need to disappear before authorities take notice of the trend? [duplicate]

Due to sensible points made in the comments, I have reworded and clarifed my question. I am trying to setup a world where due to reasons (mystical or alien) people have been going missing with no ...
7
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3answers
229 views

How does Maximilian establish a lasting Mexican Empire?

On 20 October 1861, while in Paris, Ferdinand Maximilian Joseph Maria von Hapsburg, brother of the Emperor of Austria-Hungary, received a letter from Jose Maria Gutierrez de Estrada, a Mexican ...
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4answers
201 views

What would be the major differences on our planet and civilization if humans were exclusive insectivores?

Let's say that in a different timeline, humans evolved to eat insects. How would that change the world today Note: Suppose that this didn't have any mass changes on our anatomy and that our species ...
0
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1answer
240 views

Every murderer and rapist in the world vanished without a trace. How many people is that? [closed]

In a worldwide catastrophe, every single murderer and rapist just vanished from the world at the same time. Nothing left behind, either dust, clothes, or whatever they were carrying at the moment. ...
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6answers
213 views

Is it possible for an alien organism to survive on earth?

Let's assume that our intelligent alien organism is living on an earth like planet with an atmosphere but higher gravity. Its world is on the verge of doom. Somehow it could make it to earth with a ...
165
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23answers
35k views

If everyone in the world disappeared except 35 random people, how long would it take for one of them to realize they're not alone?

Everyone suddenly disappears from earth except 35 people randomly scattered wherever they were before everyone disappeared. How long would it take on average for 2 or more people to meet? What other ...
5
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3answers
174 views

How far can civilization go without inventing the calendar?

While only counting seasons and years, but not weeks or months, how far can human civilization progress? Can they reach the middle ages? Or is the invention of the calendar such a cornerstone of ...
6
votes
1answer
181 views

What was the weather like in the Eocene?

I was reading this question earlier today. It asks about the characteristics of global winds in a modern-day earth with Eocene-like temperatures. I'm here to ask about other kinds of weather in the ...
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8answers
1k views

To Conquer the Earth by Appearing Ship

An alien species has been conquering planet after planet around the Milky Way for some time. They detected intelligent life on Earth a while back and now they decided it’s time to add us to their ...
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2answers
89 views

Plausible Reason for Aliens to Travel to Earth Before Humans [closed]

Five refugees from an alien planet are traveling to escape some cataclysmic event (not important here). I need them to land on Earth, 65 million years ago. (At this point in time, their technology is, ...
37
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9answers
11k views

What are the effects of slicing the Earth in half with a particle beam?

Scenario: An exact copy of our world is sliced in half by a particle beam. The beam has a diameter of 40 meters and moves at a speed of 0.999c. The beam slices the earth from top to bottom in 600 ...
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6answers
5k views

Which direction of slightly tilting the Earth will be most destructive?

I am a vengeful scientist who crash-landed on your Earth. While I was repairing my space ship, I had to obtain nourishment by consuming organic matter, and visited a local nutrition warehouse your ...
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2answers
115 views

Habitation of early Earth

Based on various methods of geological dating, particularly radiometric analysis, Earth is estimated to be around 4.5 billions years old. This is around the time the Earth's Moon was thought to be ...
28
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16answers
9k views

Would evolution happen the same exact way if Earth restarted?

If Earth instantaneously reverted back to when the only organisms were small microscopic creatures in the sea, would evolution happen the same exact way creating the same animals and species? Was ...
12
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9answers
6k views

Could an object from space crash into Earth and set off a majority of the nuclear bombs created?

I'm currently trying to create a separate kind of Earth, without just changing my setting to a world that fits my criteria. So I'm trying to figure out a way for Earth to have a new beginning, so that ...
12
votes
3answers
235 views

Where would a dense population of human beings live underground?

By that, I don’t mean what type of structures, I mean under which part of the Earth? It's an extremely densely populated nation. As densely populated as many major cities - think Hong Kong and more ...
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2answers
132 views

What is the value for advanced alien gain in the scientific observation of humanity? [closed]

In a nearly-real-life version of Earth there is a moderately abundant amount of alien life. However, most aliens are, in fact, not interested in humanity. So there will be no grand-landing revelation. ...
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1answer
63 views

Changing Earth? [closed]

How would energy transfer, weather and climate be different if Earth had a different axial tilt? Different diameter? Different period of rotation? Different period of revolution? Would anything change?...
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5answers
3k views

Can visible light be blocked while still allowing for light for plants to survive to pass through?

What I'm thinking for this question is that some kind of filter is put around the sun by aliens that prevents some kinds of solar energy from passing through but allows other types. Like if it ...
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3answers
158 views

Could I EMP most of Earth using nuclear weapons without damaging it otherwise?

Let's say you have the entirety of Earth's nuclear stockpile at your disposal (you don't have to use it all, and if you need it there's an infinite supply of extra ICBMs) and that every weapon you ...
3
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2answers
401 views

Would there be any mass extinction should the polarity of Earth magnetic field flips at 1 GHz? [closed]

If the polarity of our Earth magnetic field were to flip (oscillate) at around 1 GHz or 1 billion cycles per second, would it spell disaster to fauna and flora that depends on it for navigation like ...
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38answers
18k views

How can a colony of teleporters make the most money while keeping their teleportation a secret?

The Situation A colony of 100 teleporters (between the ages of 20-40) have been hidden away living like monks for 1000's of years to prevent their detection. With the death of their old leader, a ...
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3answers
360 views

All conditions being ideal (gravity, ecosystem, etc), what are the physical limits of tree growth on earth? [duplicate]

I ask the question, not as a subjective "well, Dale, what do ya reckon?" but as a perfectly factual question about tree growth here on earth provided a finite set of physical (natural, real) ...
127
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11answers
23k views

Everything alive in the world dies this instant. Without bacteria to decompose anything, what happens to the remains? What does this look like?

So when I say everything, I mean everything. Humans, animals, plants, fungi, bacteria, all dead. If the bacteria and other detritovores and decomposers can't decompose anything since they themselves ...
7
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2answers
293 views

How long would it take until we realise that suddenly nobody can conceive a child regularly?

Some time ago I asked: "How long would it take until we realise that people stopped dying from natural causes?" I today realized that similar but much more interesting (and more realistic...) ...
0
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1answer
117 views

What would the effects on Earth be if the Moon rotated around Earth at the same speed as Earth's rotation? [duplicate]

In this story I'm working on, a tower on Earth is projecting a field to the Moon that keeps it locked in place directly above where the tower is. To onlookers on Earth, the Moon seems stationary to ...
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9answers
5k views

How to make the Earth red again?

An alien entity fell in love with Earth a long time ago. When he came back to her, she looked different. He would like to return Earth to her Hadean eon when she was much hotter. This entity has ...
3
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4answers
156 views

If the world were blown to pieces, what would remain?

My question involves the earth being blown up using theoretical dark energy. In this scenario, the crust and mantle are destroyed by precisely placed weapons so that all that remains is the core. ...
3
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2answers
165 views

Is it possible to speed up the moon's orbit with today's, or near-future technology?

And I mean only making the moon orbit the Earth faster: no change in distance from Earth required. Is such a thing possible?
27
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5answers
5k views

What would Earth's Land look like in the year 3000? would there be any significant changes at all in 1000 years?

I've tried researching this question myself, but the only data I can find is over huge timescales, like situations where the continents have reformed back into a Neo-Pangea. I'm not looking for any ...
8
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1answer
326 views

Tips and principles for creating an accurate elevation map?

I'm continuing to hash out the map of my world, using tutorials found on this site and elsewhere. In some tutorials the starting elevation levels of a planet are treated pretty randomly, implying ...
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1answer
195 views

If you dug to the center of the earth would you get stuck in an infinite gravitational pull loop?

I was wondering what would happen if you dug to the center of the earth. Would you get stuck in an infinite gravitational pull loop, or would you just simply get torn in between the two pulls? Yes, I ...
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3answers
406 views

How could a human-like organism be stronger than a chimpanzee? Would this even be practical?

Disclaimer: By human-like, I am referring mostly to limb proportions similar to ours. Would it be reasonable for the average member of a bipedal species with proportions similar to those of humans ...
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2answers
222 views

How big of an asteroid could all the nuclear bombs of the world move? [duplicate]

More than the threat of nuclear war, we should worry more about asteroids destroying the Earth. For the first time we could save ourselves from that happening. Take all the nuclear missiles of the ...
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5answers
278 views

Growing blue trees

What about the atmosphere of earth makes green the best color for plants, and what would have to change to make blue the best color? The fact that these changes could not happen on earth, an so would ...
2
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1answer
193 views

What would happen if the earth was thrown into the interstellar medium? [closed]

So, for some reason the sun has randomly disappeared. The earth, along with the rest of the solar system, have been thrown out into interstellar space. Obviously, temperatures will plunge to levels ...