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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.

16
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5answers
6k views

How large would a mega structure have to be to host 1 billion people indefinitely?

Ruins of buildings, abandoned cities and suburbs dot the coasts of Earth's landmasses, inhabited by wild animals and the pieces of a once vibrant civilization. The oceans are relatively empty, the ...
-2
votes
1answer
104 views

Dig a hole to China [duplicate]

Every young kid has the dream at some point in their life of digging a hole to the other side of the world. With today's technology and an unlimited budget, would it be possible to create a tunnel ...
16
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5answers
5k views

At what temperature should the earth be cooked to prevent human infection?

Humans are the equivalent of bacteria to planet-eating monsters. And since, as we all know, eating humans is dangerous business, these monsters have decided to cook our great planet Earth before ...
27
votes
5answers
8k views

Building a road to escape Earth's gravity by making a pyramid on Antartica

If you have miles of steel pipes 10m thick, could you pump water from the sea to the centre of Antarctica, then pump it into the air like a geyser so that it falls around the pipe. As the fallen ...
4
votes
4answers
1k views

Colonizing Earth

After several centuries in exodus, humanity returns to earth to recolonize the planet. Naturally, their first question is the same as mine: Where are the best place(s) on earth to settle? Parameters:...
3
votes
5answers
158 views

Axis of rotation of a wheel space station [duplicate]

Is it possible for the axis of rotation of a rotating wheel space station in orbit to be aligned with the center of the Earth? I'm wanting a situation where a person on the station could look out one ...
64
votes
21answers
17k views

Is it possible to kill all life on Earth?

Edit: It has been suggested that my question is a duplicate of What could humans do to render the earth uninhabitable?. That question only asks what would be necessary to make human life ...
7
votes
6answers
537 views

Externally monitoring CPU/SSD activity without software access

A secret government organization created the largest and most advanced computer cluster ever. Ridiculous amounts of money went into it, and it is decades ahead of the competition. The goal of this ...
19
votes
7answers
5k views

Is it possible to remotely hack the GPS system and disable GPS service worldwide?

The title pretty much says it all. I'm wondering if it is possible through "digital" means only (aka any physical disruption of satellites is not allowed) to disable the US GPS satellite ...
12
votes
13answers
6k views

Is this state of Earth possible, after humans left for a million years?

It is the year 4056 (or probably later). The rocket with the last residents of Earth just took off, because global warming and pollution couldn't be stopped nor reverted and Earth became uninhabitable....
2
votes
3answers
434 views

How broken would a ~5ms reaction time be? [closed]

Suppose we've got one character, who for whatever reason (handwave.gif), has around a ~5ms reaction time (20-40x regular people's). That's enough to be many, many times faster than the rest of the ...
7
votes
3answers
213 views

What would a global highway look like?

I've been toying with the idea of a global highway that completely circles the globe. Ideally it would (on average) be as close to the equator as possible but also hit or at least come close to major ...
34
votes
14answers
6k views

Is there a hypothetical scenario that would make Earth uninhabitable for humans, but not for (the majority of) other animals?

I'm trying to think of a scientifically plausible reason for humanity to be forced to abandon earth that would leave animals and plants largely untouched. Is there any natural disaster that would have ...
2
votes
1answer
101 views

Climate and weather without obliquity and eccentricity?

Obliquity is the most important factor of seasons. Without axial tilt, eccentricity causes small temperature variations. What would climate and weather on Earth look like, if Earth doesn't have any ...
3
votes
3answers
267 views

How long could humans survive only on other humans?

A tragic event strikes the Earth, killing all living plants and animals except humans. With no other food source, humans turn to cannibalism. Assuming fresh water and oxygen is still available, how ...
17
votes
5answers
2k views

Could flying insects re-enter the Earth's atmosphere from space without burning up?

Huge numbers of genetically modified flying insects (purpose not disclosed here but it relates to affecting the whole of humanity) are to be dropped into the Earth's atmosphere from space so that they ...
5
votes
2answers
226 views

What's the biggest, most spectacular asteroid collision the moon could save us from?

An asteroid collision big enough and fast enough to see a massive ejection of rock and moon-chunks, from the surface of the earth AND not wipe out the population of the planet. What size and speed of ...
8
votes
1answer
628 views

If the Earth was part of an ultimate solar system, what would the sky look like?

I once show a picture depicticting the idea of an ultimate solar system: Image Copyright Sean Raymond In this solar system there are 8 planetary orbits, each containing 52 equal-mass, evenly-spaced ...
2
votes
1answer
103 views

Earth tilt changes due to space launches

How many rocket launches are needed to change the axial tilt of the Earth so much that it is noticeable with instruments available today? We can assume that we are talking about the heaviest rocket ...
6
votes
1answer
352 views

Does my plot point centered around eclipses make sense?

My main antagonist is an infant Great One that's been imprisoned below the Moon's surface and I want its influence and physical form to have a weakness to direct sunlight which, I think, gives me a ...
1
vote
2answers
79 views

Radiation causing mutations to pass on to offspring [duplicate]

The setting: In the future, Earth's population reaches over 70 billion individuals, all living under an authoritarian government. Culture, tech level and wealth are pretty monolithic and everywhere ...
-2
votes
5answers
240 views

If the earth is not flat, are we walking uphill or downhill? [closed]

If the world isn't flat and a person is walking around it from east to west. Is he walking downhill or uphill ? (This a stupid question on many levels, but I'm looking for intelligent answers.)
1
vote
2answers
89 views

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
votes
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
votes
2answers
120 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
votes
1answer
411 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 ...
0
votes
3answers
185 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
votes
1answer
91 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, ...
1
vote
1answer
194 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. ...
3
votes
6answers
356 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 ...
-5
votes
2answers
140 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 ...
9
votes
5answers
179 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 ...
2
votes
0answers
93 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/...
-1
votes
3answers
155 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 ...
1
vote
2answers
164 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
votes
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
votes
3answers
427 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
votes
3answers
586 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 ...
3
votes
4answers
221 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
votes
1answer
304 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. ...
-2
votes
6answers
253 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 ...
166
votes
23answers
37k 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 ...
6
votes
3answers
185 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
425 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 ...
8
votes
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 ...
-1
votes
2answers
114 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
votes
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 ...
34
votes
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 ...
-1
votes
2answers
127 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 ...
29
votes
16answers
10k 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 ...