Questions tagged [planets]

For questions about any large astronomical bodies classified as planets, and their effects on their systems.

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Seasons on a planet that's tidally locked with the smaller star in a dual-star system

Consider a dual-star system, with the distances between S (larger star) and J (smaller star) similar to Sun–Jupiter. A planet P rotates around J on a 90-degree ecliptic and is Earth-like otherwise. ...
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7answers
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Would the knowledge of physics on a native aquatic planet be similar to our own?

This question was stimulated by the question How would an aquatic race develop computers?. The answers obviously were based on the aquatic civilization being earth based, but what about a totally ...
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Planet with dual core

My premise involves a habitable planet with a dual core: it has two masses similar in composition to Earth's core, which revolve around each other over the course of hundreds of thousands of years. ...
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Planet illuminated by blue-shifted relic radiation

Are there realistic circumstances that a planet would be accelerated (either artificially or naturally) to the speed at which relic radiation becomes so blue-shifted that the planet is illuminated so ...
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How would solar activity change if the Sun was impacted by a planet?

Suppose that a planet whose size was somewhere between the sizes of Mercury and Jupiter impacted the Sun. Would such an event change local stellar activity sufficiently enough and for long enough ...
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Could a cold planet (tundra) develop and maintain a breathable atmosphere for humans?

Initial situation: I have cold planet with an average temperature below the freezing point. There is a magnetic field. The planet is almost as big as Earth and can have an atmosphere. The planet ...
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7answers
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What would an ammonia-based world look like?

Apart from the obvious difference that liquid ammonia needs a much colder temperature than liquid water (but ammonia-based life forms wouldn't feel that as particularly cold), what would be the most ...
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How much force needed to blow open a planet?

I recently asked this question about what would happen if a fusion bomb went off in the core of a planet, and the answer was relatively uninteresting. As was aptly said in my previous answer, the ...
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Can life exist on planets like Mercury?

Can life exist on planets as barren as Mercury? How would it survive? It seems like it couldn't. Mercury is very hot, would any life break down becuase of the heat? What other challenges face life on ...
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What would be the effect of a powerful explosive going off in the core of a planet?

What would happen if a powerful explosive went off in the core of a planet? On Earth, you have several layers of the planet, the crust, the magma, the outer core, and the inner core. Right now, human ...
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Is it possible to cool down a volcanic planet?

Here, I asked if it's possible to terraform a hot planet. But now, if we have a volcanic active planet, can we use the same techniques to cool it down? Normally, the planet cool off slowly after its ...
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Impacts of a stellar Jupiter

In the book 2010: Odyssey Two by Arthur C. Clarke, Jupiter is turned into a star. Presumably this is done by making it more dense, so if Jupiter were to reach that density and become a star, what ...
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Life on a planet with multiple gas layers

Could a terrestrial planet have a stable set of layers of atmospheres, and could different lifeforms evolve within those different layers? This question is inspired by the diversity found on Earth. ...
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Can a planet have a figure-8 type of orbit around two separate stars?

Could a planet have an orbit in the shape of a figure 8 around twin (possibly binary) stars? Mostly curious about the physical possibility of such an orbital arrangement; is it stable over a long ...
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How long does terraforming take if you have to build the planet from asteroids?

I'd like to set a story in our solar system with Earth and the inner planets becoming uninhabitable and a new planet being required. If human beings decided to build a world by making slight ...
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Gas Giant with Small Moons within the Gas? [duplicate]

Suppose a gas giant is incredibly large with a super dense, solid core that hold the gas around it like an atmosphere. Would small moons be able to exist within the gas, assuming the gas has little ...
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Can a planet realistically have multiple suns?

Several science fiction books I have read (including, IINM, Nightfall by Asimov) have featured planets with several suns. Some worlds where this happened wrought interesting effects on the inhabitants ...
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Living Planet Possible?

Although a question about how large a living thing could be has been asked and answered, would a being such as Mogo from DC's Green Lantern series be possible? Mogo is the size of Earth roughly can ...
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757 views

Generating a magnetic field for planets with iron-cores that is revertable?

I'm looking for a solution to generate a strong enough magnetic field for planets with iron-cores - in my case, Mars - to keep the atmosphere from getting blow away by the solar winds (and ignoring ...
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Is it possible to terraform a hot planet?

I want to make a hot planet habitable for mankind. It could be a planet in the habitable zone like Venus or outside of the zone like Mercury. These are just examples. Someone said here: Terraforming ...
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What would the sky look like from the surface of a planet with rings?

What would a planet's rings look like from the surface of that planet? Would the rings be perceived to be stationary or move across the sky, and would the alignment of the rings relative to the axis ...
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1answer
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What effects would there be for a hole in Earth

Imagine the Earth is struck by a laser/magic beam capable of piercing it and leaving a lasting hole. What effects would observed? Would there be a difference between the hole(s) being made in the ...
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What kind of effects would be seen on Earth if it was pulled from orbit?

Imagine the Earth is sucked into a wormhole powerful enough to pull it out of it's current orbit. the ones who created the wormhole wanted to move earth to protect it however didn't want their actions/...
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Varying Gravity

Suppose a very large planet orbited a star or other spacial body in an oval shaped path, similar to Earth's but closer to induce a varying gravity during orbit. The planet has a large gravity well ...
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Would co-orbital planets with very similar convergent evolutionary paths be possible?

Picture, if you will, four planets sharing the exact same orbit and orbital speed, and separated by exactly same distance from each other. Each planet is the same size and roughly the same ...
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Terraforming a very cold planet?

One of the solution to make a cold planet habitable for us is to increase the greenhouse effect. It works with planets like Mars that are inside the habitable zone but would it be enough for a planet ...
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Terraforming a gas giant into an habitable planet

Is it possible (for humans)? My main concern was heavy gravity because they are much bigger and heavier. But it appears that in our system, the gas giants (but not Jupiter) all have a similar surface ...
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What would happen to a planet that was electrically charged?

If a planet had such a large imbalance of protons and electrons that it possessed a net negative or positive charge what would happen to it and its solar system? First, could it be stable, or would ...
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1answer
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What would be the effects of traveling faster than light on a worldship?

Assuming a civilization has the technology and capability to build a worldship, a planet that doubles as a spacecraft, installs an FTL drive on it and has the energy to power it, what would the ...
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What would push a civilization to terraform a planet considering the complexity of this process?

Terraforming is the process of transforming a celestial body to become habitable by Earth-like life. Even when I try to imagine an advanced civilization, the cost, time and complexity to terraform a ...
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How would a planetary nebula affect a planet?

Let's say I have a binary star system. The planet is orbiting the smallest star similar to the Sun at 1 AU, the same Earth-Sun distance. The other star is located at around 50-100 AU from the Sun ...
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Can an atmosphere englobe a planetary ring?

Would it be possible for the atmosphere of a planet to reach beyond its planetary ring so that earth-like biology could develop on some of the asteroids there? This question is mainly about whether ...
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What are the factors influencing the temperature of my world?

The question is rather simple, the answer is more complex. It is to answer why some places are colder than others. Example: North America is colder than Europe at the same latitude.
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How much technology for a ring-world to work?

There is this setup that I've seen a few times of a ring-shaped world where people live on the inner side. My question is: what is the minimum advancement of technology for such a thing to happen? So ...
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What complications would arise from a world with an internal atmosphere and environment?

For a long, long, long time I have had a concept of a world that exists on the inside of a hallowed-out sphere. The basic construction of the world is like this: It is a large world, at the center ...
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Hollow planet with another planet inside it

I was wondering what would happen if there was a planet with a "shell" of stone entirely surrounding it (not connected, just held in place by gravity), with a few holes all the way through the outer ...
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Is it possible to advertise on the moon?

I remember a cartoon about some spy guy. In that cartoon they did mass media by projecting from the surface of the earth to the moon in the night sky. Would that technique be possible? Could an ...
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How would the global environment of a completely urbanized city-planet be affected?

Related: How would a completely urbanized city-planet support its population? How a completely urbanized city-planet be maintained? Why would a completely urbanized city-planet exist? The properties ...
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What environment would make leaves light blue?

What environmental effects (if any) would ever cause blue to be a colour that a plant would choose as an evolutionary advantage? Bonus: I'm looking for light blue plants as a preference. EDIT: ...
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How could you dig a hole through the fluid mantle of a planet?

The Question of the Tunnel through a Planet grinds my mind. How could you dig a Hole through the fluid mantle of a planet? Would your walls not constantly break and collapse on you after the 15-20 ...
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What political structure would develop within an interplanetary civilization?

Conquest and discovery has been an important part of developing the global political structure of today's Earth. After we expand and settle other planets, whether within the same solar system or not, ...
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How realistic is it that cultures on different planets influenced each other?

If two (or more) planets are within travel distance from each other and they often trade with each other, how likely is it that these planets cultures influence(d) each other? For example: On planet ...
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995 views

Life on an Earth-like planet with solid core?

How big a difference does the Earth's liquid outer core and mantle make for the evolution of complex life? If all of Earth's parameters would be the same, but it had a solid interior just like Mars, ...
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Would there be any reason to bore a tunnel entirely through a world?

I am looking to have a Tunnel drilled through a world and deal with the physics of What happens in the centre of a planet, what happens with the heat at the core and whether it is faster to travel ...
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What determines the length of a day on a planet?

The length of a day on different planets in the solar system varies a lot. For instance, Mars' day is about the same length as Earth, while a day on Venus is equivalent to 243 Earth days (source). ...
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What effect does moving the magnetic poles of a planet have?

On Earth the planet's magnetic poles line up fairly well with the geographic poles. This makes things like navigation very straightforward as all compasses point to (roughly) the north pole. However ...
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How would two planets with identical but perpendicular orbits affect each other?

I'm exploring this idea for a fantasy world, and I was wondering how these planets would affect each other. The system would feature orbits in all three dimensions, not relatively flat like ours is. ...
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How can I create an enormous crater?

My world has a huge crater (4400 miles in diameter) on a world that's roughly earth equivalent (so a circumference of 25000 miles). The native population doesn't need to know how it was formed but it ...
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Ratio between planet-size and terrain elevation?

Let's imagine we have an algorithm that produce an elevation-map for a sphere. I wonder if the ratio between the planet radius and the delta between the highest and lowest altitude is a constant or ...
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How extensive could a habitable twilight zone be on a tidally locked planet?

If a planet always faces the same side to the sun, so that it has a permanent night side and a permanent day side, it will have a twilight zone in between the two sides. This will be a band around the ...