Questions tagged [tides]

For questions about the gravitational interaction between astronomical bodies. This tag often describes water currents, but can also be applied to planetary phenomena such as tidal locking and tidal heating.

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Tides on a tidally locked planet

Picture the classic Earth-like tidally locked planet, with a frozen dark side, a boiling stormy light side, and a thin strip of habitable land along the terminator. The planet is similar in size and ...
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Tides on a planet with 5 moons? [duplicate]

What would be the effects on an earth-like planet with 5 moons, one the size of Earth's moon and the others approximately 1/10th its size? How massive would the tides be when they align?
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features of a planet to have a massive periodic tsunami only on one coast?

What features should be present on a planet to have so that a side of an arcipelago of islands or continents have periodically a huge tide or tsunami periodically ?
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Effects of multiple moons on tides? [duplicate]

Hello I would like to ask what would be the effect of 0 - 1 - 2 - 3 moons on an earthlike planet? What would change? Consider may be a moon like our own and the other two of progressive smaller size? ...
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How to make a world with very long tide cycle

I want to create a world for a story: Charybdis - a world of high tides. Very high tides. Tides that drag whole ocean around the world - or most of it - in a long cycle. It must lasts at least several ...
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Are there Tides Affecting Stellar Brightness?

I'm working on a fantasy story set in a slightly modified version of the Trappist-1 system (all orbits are perfectly resonant rather than only nearly so), and I am trying to get as good of an ...
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What arrangement of celestial bodies would allow high and low tide to last for the longest time?

I want to create a planet that has the longest possible length of time that the tide is low to allow land animals to forage in the exposed shoreline ecosystems. What arrangement of star, planet and ...
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15 votes
8 answers
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Tide without moons

I’m creating a planet which is relatively similar in size towards earth being slightly smaller. It’s covered in oceans and about only 17% of it is covered in land. The planet has no moons. I don’t ...
2 votes
0 answers
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What would an Earth-like planet with a mostly stable ring be like? [closed]

I recently watched a video talking about what would happen if our moon was on a collision course with the Earth and they described it being ripped apart by Earth's gravity. This made me want to re-...
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1 answer
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How to Create Tidal Tsunamis

In my world, I have the problem of dealing with a world that doesn't experience seasons or significant latitudinal variation when it comes to climate (it is essentially all tropical rainforest), and ...
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1 answer
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Could galactic tides power FTL travel?

I came across galactic tides while trying to find a new concept for FTL travel for a SF novel. Further research suggests it was just a coincidence, that nobody has ever suggested any possible ...
25 votes
10 answers
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How would you build a harbor in a world with *intense* tides?

Long story short, my world is set on a habitable moon of a gas giant, and as a result has some very intense tides (about 5x those of Earth, averaging a few dozen foot difference between high and low ...
4 votes
3 answers
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How much can the shape of the oceans affect the tides (on my earth-like planet)?

I have been concerned about the effect of tidal forces on my earth-like moon (0.7 earth masses and 0.88 earth radii), specifically given that because of the primary's mass (3 Jupiters, 1.04 Jupiter ...
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3 answers
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How to make tides on my world less destructive?

I am currently developing an habitable moon oribiting a gas giant in a resonant orbit, however at the current time I am concerned about the effect of the gas giant on my world when it comes to tidal ...
6 votes
1 answer
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How bad would tides be on an habitable moon orbiting a gas giant in a 5:2 resonance (meaning not actual tidal locking)?

I have been working on an habitable moon (roughly 0.7 to 0.9 times the mass of the earth) orbiting a gas giant about 3 times the mass of jupiter and I have been thinking about a scenario in which I'd ...
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1 answer
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How might extreme tides affect the evolution of life?

I was hypothesizing about making a planet with a different path of evolution. A planet with dominant species being more akin to amphibians albeit further down the evolutionary chain. Would extreme ...
7 votes
4 answers
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Would it be possible to have an earth-sized planet have much larger tides while remaining habitable?

I want a planet with roughly the same mass and volume of earth to have tides on a much larger scale than earth, enough that the coast would be extended for at least several hundred feet at low tide in ...
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Could a land mass reasonably exist where I want it on my earth-like binary planet? [closed]

I've been doing a lot of research lately on my binary planet system for the series I'm writing. Some details I've already worked out: The system's star is 0.6 solar masses, 0.8 solar radii and 0.3 ...
10 votes
1 answer
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If I enter a large island into the North Sea, how would that impact local climate, weather & tides?

For the purpose of a story, I'm having an additional island in the North Sea. The island is where the Doggerbank used to be, but a bit larger. The highest "mountaintops" are around 1000m, ...
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Landmasses on a planet with enormous tides

Following up on this question, where the answers made me wonder about another aspect of my world. My planet is a super-earth orbiting really close to a Red Dwarf star, resulting in enormous tides. The ...
4 votes
2 answers
280 views

What effects would an extra few moons have on my planet?

While I was worldbuilding I thought about how cool it would be if my planet had maybe two, maybe three moons. Does this change the world itself? For example: How are the tides and ocean affected? How ...
4 votes
1 answer
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How would eclipses change (both solar and lunar) if the moon was half the distance from the Earth?

I'm working on building a fantasy world where the moon is in a lower orbit. I've already worked out the effect on tides; 4x stronger high tides slightly further apart, increased coastal erosion, more ...
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Maximum Feasible Size For Tidal Mudflats

Assuming real world physics and an earth-like world, how big of an area could a/some tidal mudflats cover? Criteria- More or less consistently mudflats that are partially submerged at high tides Rock ...
4 votes
1 answer
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What would happen to a world with three moons?

The world I’m building is approximately 1/3 of the size of earth and it has 3 moons orbiting it. The orbits are all different but occasionally they have either a full moon or a new moon on the same ...
5 votes
1 answer
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Long Term Evolution of Double Planet System in Close Orbit

So, I have a double-planet system in a solar system and I'd like to analyze the long-term evolution of these two planets. In particular, I'd like to know: Is this setup unrealistic in some way? The ...
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What do I bear in mind, creating an earth-like world with TWO moons?

I'm writing a series that takes place on an earth-like planet, and I really want there to be two moons, specifically. I want there to be tides, but I don't want them to be so intense that they ...
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How great could tides be on Earth (or an Earth-like planet) if you swapped the Moon? [closed]

Assuming a planet would have Earth's surface gravity and about the same share of it's surface covered by water, how great could you make tides if you could make the moon bigger, smaller, denser, less ...
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Would tidal acceleration mean doom for this system?

So we have a Super Earth of ten Earth masses, just on the threshold, and it has three Mars sized moons (so a mass ratio of 100/3, more than Saturn Vs 3 Earths). They go 40,000km, 100,000km, 250,000km ...
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Amount of force needed to nullify the moon's tidal lock?

What size and/or mass of impactor would need to impact the moon to destroy its tidal lock so that it's orbit is noticeable within its phases? What side effects would this impactor cause, and how would ...
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3 votes
1 answer
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plausibility of this double planet system? [duplicate]

So, I'm about to start a new worldbuilding project for a fantasy world, but I want to try to make the basic world at least somewhat plausible; the magic in the setting is going to be pretty low-key, ...
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What would the effects be on a planet whose moon orbits at a speed just faster than a geosynchronous orbit, so there are more months than days?

Would anyone be able to check some math/ let me know if I'm thinking of this the correct way? I had an idea of the moon appearing basically stationary in the sky, but in fact it orbits just faster ...
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Riptides caused by satellite pull

How many moons would be required to induce almost continual tidal pull to create a near constant tidal riptides?
11 votes
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Equatorial oceanic river caused by tides

The setting: A planet with two main landmasses, each one's center located more or less at each pole of the planet. Liquid water ocean in between them, wrapping fully, if not directly (due to the non-...
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3 answers
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Can a planet still function with a damaged moon?

I'm thinking of having a world that has a moon that's been partially split (so not fully halved) with the debris slowly separating from it. At night you'd see the split moon mainly and lots of ...
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Tides on a Super Close In Moon

I have a moon covered in liquid water that orbits a super-Earth very closely. As you might imagine, the tides are incredibly strong on this moon. However, it is tidally locked and so does not ...
2 votes
1 answer
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Only changing the mass of the moon, how much can lunar mass increase before the Earth becomes uninhabitable?

Bonus: How much would the increase in lunar mass increase average tides? & which factors would cause the Earth to become uninhabitable?
46 votes
13 answers
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Can a planet be tidally unlocked?

In my answer to another question, I suggested that the Super-Earth in question be tidally locked to its host star for a period of time while part of its surface experienced a bombardment. After that's ...
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10 votes
5 answers
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Tides with 3 Largish Moons

I would like to have an Earth-like planet (~Earth gravity, ~Earth day, ~Earth year, and liquid water oceans) with extreme variance in its tides. I want the lowest tide to reveal about 30 miles of ...
9 votes
2 answers
645 views

Temperature and climate "under" the gas giant in a tidally locked moon

I've begun the laborious (but fun!) process of putting another world together. Known constraints include: Habitable, (super-)Earth-sized, tidally-locked moon to a gas giant; the giant, where visible,...
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6 votes
3 answers
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How can I create a new planet/satellite system that generates tides of 6-8 metres?

I'm creating a new setting for a novel. I'd like to build a world where the interaction between the planet and its satellite/satellites can generate a normal tide excursion around 6/8 metres. ...
6 votes
2 answers
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Independently Tidelocked Moon?

Simple question that might seem odd. Not going to get too specific but I am curious, more or less, as to what it would look like for a planet that had a moon (A habital one) which was in essence ...
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Co-orbits and Tides

I've seen many questions about tides and tidal variations on a wide variety of interesting single star, multi star, single planet, binary planet, single moon, multiple moon, and even ring system ...
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2 answers
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Finding the size of tides

I have a planetary system in which there is a huge planet and a moon orbiting it which has an atmosphere and water (and actually everything needed to sustain life). Thing is that I'm sure the mass of ...
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11 votes
6 answers
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Materials in a tidal water world

I'm trying to create a people that live on this rolling tide (see previous question or on 'millers planet') but I haven't figured out where they would get wood to build their boats/homes. If the tide ...
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7 votes
1 answer
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Massive tides and resources

Assuming a situation similar to this, where the moon causes slower but massive tides that slowly encircle the globe. Would the poles be constantly underwater or not underwater (like A or B below)?: ...
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19 votes
3 answers
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Is there software to help me model tides?

I have a planet orbiting a roughly Sun-like star, accompanied by a moon that's a bit more massive than our own Moon. The surface is about two-thirds water and one-third land, with most of the land in ...
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1 vote
1 answer
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Two planets with the same orbital period [duplicate]

I have the following star system configuration: All bodies always stay on one line. Star is similar to sun by parameters. "Green" planet is Earth-like exoplanet with 1 earth-year orbital period, ...
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Would it be possible to create tides that fluctuate every 25 days and rise/recede quite drastically. possibly up to a mile

Like the title, my world has drastic tides that complete a cycle in roughly 25 days. is this possible? My limited knowledge of astronomy leaves me pretty limited. I understand that there would have to ...
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1 answer
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Is it possible to have a near tidally locked planet?

I'm working on a story where the characters are stranded on a planet that turns so incredibly slow that it acts like a tidally locked planet, with one side burning and the other frozen. However ...
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How big does a moon have to be to have the earth locked to it?

I would like a earth-moon system like Pluto-Charon (but with earth instead of Pluto) where both will be tidally locked to each other within something like 3 billion years (before complex life appears)....