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Q&A How Would the Sport of Wrestling Change in a Microgravity Environment?

Drastically. For one thing, pinning your opponent's shoulder to the mat is no longer possible. Very different criteria would be required to determine winning. The different objectives would in t...

posted 1y ago by Olin Lathrop‭

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Q&A How would an interstellar spaceship's speedometer work if everything else is moving?

You would send out a small laser or radar retroreflector out of the side of your ship and observe the tracking angle. Knowing the speed of your marker you can calculate the speed of your ship with...

posted 2y ago by KalleMP‭

Answer
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Meta Renaming Researched Q&A

Before launching the site, we had a discussion on Codidact Meta about naming the category we currently called "Researched Q&A". Other possibilities we explored included "Hard science", our sta...

2 answers  ·  posted 4y ago by HDE 226868‭  ·  edited 4y ago by Monica Cellio‭

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Q&A Could a habitable planet lit by the cosmic microwave background plausibly exist?

A back of the envelope calculation suggests that you need a velocity relative to the CMBR of more than 0.9c. (1mm microwaves blue-shifted to 570nm light typical of yellow dwarves) This is a proble...

posted 3y ago by dsr‭

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Rigorous Science Create "gold" from lead (or other substances)

What I need is a substance which could have been mixed by an alchemist and is as gold-like as possible. How about gold itself? Bear with me, here: While there are a lot of things that look ki...

posted 7y ago by type_outcast‭  ·  edited 4y ago by HDE 226868‭

Answer
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Q&A What if the Planck constant was exactly zero?

This question really has no answer because it is phrased in a way which doesn't actually have much meaning. As phrased, it appears as though the universe is governed by these constants, which can ...

posted 8y ago by Cort Ammon - Reinstate Monica‭  ·  edited 4y ago by HDE 226868‭

Answer
72%
+6 −1
Q&A Magnet strong enough to rip the iron out of your body feasible?

Yes and No. Yes: Therefore, strong enough magnetic fields have the ability to deform and even break objects. When a magnetic field gets stronger than about 500,000 Gauss, objects get ripped to pie...

posted 3y ago by James Jenkins‭  ·  edited 3y ago by James Jenkins‭

Answer
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Q&A Why would merfolk have hair?

A classic image of mermaids are their long flowing hair that swishes in the water. But in the scientifically realistic sense this makes none. The hair would be nothing more than a nuisance to the m...

21 answers  ·  posted 8y ago by Uncle Tres‭  ·  last activity 3y ago by PinoBatch‭

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Q&A How to make an animal which can only breed for a certain number of generations?

What would be the best way in which to genetically modify (or create through some other method) an animal which breeds normally for a certain number (50?) of generations before becoming sterile? Ge...

13 answers  ·  posted 5y ago by Richard Smith‭  ·  last activity 3y ago by James Jenkins‭

Question biology
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Q&A Would there be any major disadvantages for a species to have six legs instead of four?

I want a world in which animals roam the wilderness on four legs, yet at least some of them are able to do the kind of carrying and fine handling of objects done by humans. The planet is superficia...

13 answers  ·  posted 5y ago by Canina‭  ·  edited 3y ago by Canina‭

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Q&A What conditions would cause an extremely dense (dark) coniferous forest to grow?

Nature does this on its own, given enough time. Different tree species have evolved different strategies. Some require a lot of sun, grow fast, and make a lot of seeds before being overshadowed b...

posted 4y ago by Olin Lathrop‭

Answer
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Q&A Would a huge amount of asteroids hitting Earth change its rotation speed or destroy the planet?

The Earth would be broken into pieces if the total energy delivered by the impacts was comparable to the gravitational binding energy of the planet. Earth is a sphere, so its binding energy is $$U=...

posted 3y ago by HDE 226868‭  ·  last activity 3y ago by HDE 226868‭

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Q&A How do I realistically keep my large mammalian predator hidden from other pack hunters.

I don't think it is feasible for an elephant-sized hyena to hide on the actual hunting grounds, least of all from predators that have similar excellent senses. What it should do is to lay low some ...

posted 3y ago by Lundin‭

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Q&A Is a genetically modified human with a much higher height plausible?

Get ready to wave those hands How active do these giants need to be? I ask because Wikipedia's list of tallest people notes a lot of health problems. The 25 tallest people who are no longer living...

posted 4y ago by Andrew Brēza‭  ·  last activity 4y ago by Andrew Brēza‭

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Q&A Natural ways to acquire gravity and heat for a colony on earth's moon

Gravity You seem to assume that the Moon's mass is mostly concentrated in its core. While I didn't find detailed data on the Moon's density distribution, this Wikipedia page tells that the density...

posted 3y ago by celtschk‭  ·  edited 3y ago by celtschk‭

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Q&A Could there be a way for a solar system to be very precise, so that the lunar calendar and solar calendar align?

Something you may not have thought of: the Earth-Luna system has the barycenter inside the Earth's radius. Fairly deep inside, in fact -- about 25% of the way down from the surface. Your system as...

posted 10mo ago by dsr‭

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Meta Requirements of posts in Rigorous Science

To replace using the like of the 'hard-science' tag on Worldbuilding SE, we have the 'Rigorous Science' category. As evident in the name, this involves 'research' of some form, but what does this m...

2 answers  ·  posted 4y ago by Mithrandir24601‭  ·  edited 4y ago by HDE 226868‭

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Meta Character set conversion(?) failure during initial import from SE

It looks like something went wrong during the import, causing imported posts to get the wrong character encoding. I fixed one at https://speculative-science.codidact.com/q/225476, but have come ac...

1 answer  ·  posted 4y ago by Canina‭  ·  last activity 4y ago by ArtOfCode‭

Question imported-posts
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Q&A How to protect intelligent fluids from heat damage?

The Strawberry Jam can freeze parts in place that don't heat up much. Parts of the trigger mechanism would be a good candidate. So is making the lock stuck in safety mode. Also, you don't have a...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

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Q&A Where should my island mountain ranges be, based on my plate tectonics?

It looks like you will have uplift, frequent earthquakes, and volcanos in the lower part of your island where three plates are jamming together. In the northern part, the plates are spreading. Yo...

posted 2mo ago by Olin Lathrop‭

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Q&A How to protect intelligent fluids from heat damage?

This is not a bug, it is a feature The gun isn't hot until you fire it. That first shot will, due to the trauma, cause the jam to solidify and block the bullet. At the same time, the heat will dea...

posted 3y ago by manassehkatz‭

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Meta Do we want to keep the [science-based] and [reality-check] tags?

I would think that, at the very least, [science-based] is implied by this site's scope and doesn't add anything. (I didn't think to ask for it to be stripped on import, but presumably it's not har...

posted 4y ago by Monica Cellio‭

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Meta How can we grow this community?

Codidact's communities have a lot of great content that is helping people on the Internet. Our communities are small, though, and sustainable communities depend on having lots of active, engaged p...

5 answers  ·  posted 2y ago by Monica Cellio‭  ·  last activity 1y ago by chris-barry‭

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Meta Is Scientific Speculation the Right Place for a Discussion Series About Space Sports?

I feel like science fiction doesn't have many sports, other than the occasional laser battle or fantasy sword duel. I'd like to start a discussion series about sports in a low-gravity/no-gravity e...

1 answer  ·  posted 1y ago by James McLellan‭  ·  edited 1y ago by hkotsubo‭

Question discussion
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Q&A What is the most efficent way of killing prey much larger than yourself?

The Honey Badger is known to kill water buffalo by ripping out their scrotum and letting them bleed out. Mostly out of spite I think for being disturbed, they mostly eat small game, honey, bee lar...

posted 2y ago by KalleMP‭

Answer