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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46 votes
13 answers
13k views

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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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 ...
21 votes
1 answer
2k views

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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19 votes
3 answers
598 views

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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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 ...
14 votes
11 answers
3k views

How to create tides in a small sea?

I've done a bit of research and small bodies of water don't have significant tides, even the Mediterranean doesn't have particularly large tides. So how can I get bigger tides on a small body of ...
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11 votes
6 answers
2k views

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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11 votes
9 answers
1k views

Can one or multiple moon(s) pull the sea around my planet?

I'm building a world which is 50% covered by the sea. For approximately half the year, the sea covers one hemisphere; for the other half it moves to the other hemisphere, leaving the first a dry sea-...
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11 votes
3 answers
222 views

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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10 votes
3 answers
3k views

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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10 votes
5 answers
711 views

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 ...
10 votes
6 answers
582 views

Do moons determine the speeds at which tides move? Is there a limit to this speed?

I'm writing a short story that takes place on an imaginary planet that is 88% ocean. The planet has two moons and one continent that is regularly flooded under 500 to 1500 feet of water. The tides are ...
10 votes
1 answer
288 views

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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9 votes
4 answers
458 views

Are these conditions for a planet realistic?

Since I'm creating a "new world" for my story, I wanted to know if the following conditions would work for an Earth-like planet: Its moon (more or less same size as our moon) being much closer (but ...
9 votes
2 answers
673 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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8 votes
3 answers
502 views

How do the tides work when the sun powers the moon to keep out evil?

So I wanted to give the players a reason to eventually go to the moon. But this is a fantasy setting, so having the moon just be a big rock floating in space would just be so.... blasé. So I came up ...
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8 votes
2 answers
1k views

Rock formations & islands on a moon with megamareal tides

This concerns a habitable, earthlike moon orbiting a gas giant, which is not tidal locked, and has an elliptical orbit eccentric enough to avoid frequent deep winter freezes (the freezes do happen, ...
8 votes
1 answer
360 views

Where to find equations to calculate tidal heating in a binary planet/planetesimal system?

I'm building a very small homeworld (0.602 M$_e$) with a very large moon (0.0711 M$_e$) that orbit each other at a barycenter about 7.12 planetary radii (1 R = 0.870 R$_e$) from the primary's center; ...
7 votes
4 answers
385 views

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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7 votes
1 answer
706 views

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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7 votes
5 answers
1k views

What kind of planet would have a “megamareal” tidal range?

A large group of people has been banished from Earth and punished to scrape out a perilous existence on a strange planet. The planet has breathable atmosphere, and consists of an immense ocean teeming ...
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7 votes
1 answer
237 views

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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7 votes
1 answer
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Tides on a double planet

I am making a world to be the setting of my future fantasy works, which is to say I really have no story planned but I want to have a world for it when I do and I want said world to be likely give me ...
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7 votes
2 answers
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How to determine whether my dragon hunting trophy can stay afloat on a lake?

Continued from Can a person covered in mud survive an ordeal with fire breathing dragon? Miraculously my protagonist managed to subdue the fire breathing dragon and knock it unconscious. He then tied ...
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7 votes
4 answers
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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 ...
7 votes
1 answer
323 views

How would tidal forces impact two habitable moons in a horseshoe orbit?

I saw this video a while ago, and recently it's gotten me thinking. Towards the end of Artifexian's video on gas giants and habitable moons, he mentions the idea of having 2 habitable moons in a ...
7 votes
2 answers
102 views

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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6 votes
3 answers
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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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6 votes
3 answers
225 views

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 ...
6 votes
3 answers
183 views

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
1 answer
166 views

What are the circumstances in which swamps or everglades can have dramatic low and high tides?

I'm actually trying to create an alien ecosystem, so changing orbits, what's exhibiting tidal forces and the geography and such is welcome if needed. I also wonder how stable a setup with dramatic ...
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6 votes
4 answers
573 views

Almost tidally locked to moon and the tides it would create

I have a world with a moon, much like Earth and the Moon, except that the planet is almost tidally locked to the moon. The moon therefore appears to move only very slowly through the sky, and takes, ...
6 votes
2 answers
99 views

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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6 votes
1 answer
124 views

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 ...
6 votes
1 answer
106 views

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 ...
6 votes
1 answer
202 views

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 ...
6 votes
1 answer
534 views

Size and Effect of Ocean Tides on My World

I'm building a world that orbits close in to an M-Dwarf sun. I've figured out a bunch of the physical parameters of the world, I just can't quite get a solid handle on my tides. I know my tides will ...
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5 votes
6 answers
1k views

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 ...
5 votes
2 answers
2k views

I'm building a fantasy world like Earth but it has two moons adjacent to each other in a co-orbital configuration and need help

I am looking for help on the following: Will that have any affect on the length of days and nights? Would having two moons create a higher body of water on the planet due to increased tides? (i.e. ...
5 votes
2 answers
214 views

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 ...
5 votes
1 answer
244 views

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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4 votes
6 answers
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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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4 votes
2 answers
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Tides on a Water World

How would waves and tides work on a planet that is completely covered by Ocean? It would have: Oceans of Similar depth to Earth's Atmosphere extremely similar to Earth's Same type of star and ...
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4 votes
5 answers
439 views

Is a habitable planet in a sextenary star system possible?

So I want my planet to have six suns, but I'm not sure how far apart these stars would have to be from each other to not produce adverse effects on the planet that would prevent life from developing. ...
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4 votes
2 answers
529 views

What would Earth tides look like if the Moon was in a polar orbit (instead of an equatorial orbit)?

Take the earth-moon system. Shift the moon's orbital plane about 90 degrees so that it is passes over both poles. What would the tides on this world look like? Sub-questions: What would the cycle ...
4 votes
2 answers
99 views

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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4 votes
1 answer
459 views

Habitable moon of a gas giant: working out the size of the tide

I'm creating a fictional planet that orbits a gas giant (a lot like Jupiter). I'm working out all the issues listed here and here. But what I'm really having trouble with is the size of the tide. In ...
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4 votes
3 answers
201 views

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 ...
4 votes
2 answers
317 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
274 views

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 ...