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Q&A If I were to put a moon-mass object in Mars orbit, how long would it take to restart the dynamo effect in Mars' core?

Mars has an inactive mantle and core and thus little magnetosphere to speak of. Assume that a lunar mass object is placed in Mars orbit at 300,000 kilometers out (one light-second). Given the tidal...

1 answer  ·  posted 7y ago by B.fox‭  ·  last activity 7y ago by B.fox‭

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Q&A If life evolved on a planet with two suns, one emitting in the ultraviolet and one in the infrared, what light would that life evolve to see?

Let's say we have a binary star system, with a high mass star and a low mass, red dwarf star. High mass stars emit their light mainly in the ultraviolet while low mass stars emit mainly in the infr...

1 answer  ·  posted 7y ago by Gliese‭  ·  last activity 7y ago by Gliese‭

Question biology xenobiology
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Q&A Fact-based fiction: Electric, no-fuel propulsion for autonomous space drone

In an upcoming writing project, I will be focusing on an autonomous drone that picks through space wreckage. It has access to intermittent star light, but has no source of chemical propellant. The ...

8 answers  ·  posted 7y ago by Jack Stout‭  ·  last activity 5y ago by Jack Stout‭

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Q&A How will birds be different on a <1g world?

First, I guess the conditions of the world are in order. It's approximately 85% the mass of earth and there is going to be a full ecosystem with all the usual types of bugs, insects, trees, and pre...

2 answers  ·  posted 7y ago by achinaghost52‭  ·  last activity 7y ago by achinaghost52‭

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Q&A How can my dragon convert heat to usable energy?

In my world, dragons are big, and require lots of energy just to support their massive bodies and huge brains - and of course, to fly, using enormous oversized wings. Rather than causing mass extin...

3 answers  ·  posted 7y ago by SPavel‭  ·  last activity 7y ago by SPavel‭

Question biology dragons
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Q&A Climate Change after a Sudden Drop in Emissions

Suppose we have a world that saw a sudden collapse of civilization, not so violent that humans are suddenly struggling to survive but severe enough to cause humans to revert to a mix of city-state,...

3 answers  ·  posted 7y ago by Geoffrey Carlton‭  ·  last activity 7y ago by Geoffrey Carlton‭

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Q&A Could you float a boat on a gas giant?

A futuristic entrepreneur wants to start a cruise line company and needs to build a cruise ship that will not only float on a gas giant, but be habitable throughout a 7 day trip (for the uber-rich ...

7 answers  ·  posted 7y ago by Austin A‭  ·  last activity 6y ago by Austin A‭

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Q&A How practical is the sandcrawler as a vehicle?

A sandcrawler is is a tracked vehicle about 40 meters long, 20 meters tall, and 15 meters wide. It has a thick outer hull for protection from the elements. It has eight sets of tracks, four abreast...

2 answers  ·  posted 7y ago by Robbie‭  ·  last activity 7y ago by Robbie‭

Question vehicles
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Q&A What deficiency would make my raiders the most desperate?

Out in the desert wastes of my planet, there are living multiple tribes of psychotic raiders who have acquired a number of harmful mutations due to naturally high radiation in the areas that they l...

7 answers  ·  posted 7y ago by Nick‭  ·  last activity 7y ago by Nick‭

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Q&A How to destroy a star system?

The admiral of a space fleet that belongs to a Type 3 civilization has been given orders to obliterate all planets within the habitable zone of a Sun like star. Some of the planets have been ident...

9 answers  ·  posted 7y ago by Michael Kutz‭  ·  last activity 7y ago by Michael Kutz‭

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Q&A How could a natural road form across a sea?

BACKGROUND I'd like my earth-like world to have a naturally formed narrow strip of land that bridges a major sea. Now, before anyone rushes off to comment about island chains and land bridges, I'l...

17 answers  ·  posted 7y ago by Random‭  ·  last activity 7y ago by Random‭

Question geology tectonics sea
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Q&A Small-scale aviation without fossil fuels

In my setting, fossil fuels do not exist. I'm handwaving an alternative behavior of radioactive material, and alternative magnetism-like forces. These are explained below. My question now is: Can ...

1 answer  ·  posted 7y ago by Orphevs‭  ·  last activity 7y ago by Orphevs‭

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Q&A So much smoke that the suns rays never get through?

In my book I have a city which is constantly dark. The sun doesn't reach it. This is because it's a city of waste, so all the waste gets thrown into this city and lit on fire every single day, whic...

8 answers  ·  posted 6y ago by kai Z‭  ·  last activity 6y ago by kai Z‭

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Q&A Scientific explanation for a exceptionally bright night sky

On an alternative Earth live the people of Tcelonia. One of their founding myths goes that, in the dawn of times, when they were under the menace of being attacked by an enemy population, for an e...

6 answers  ·  posted 6y ago by L.Dutch - Reinstate Monica‭  ·  last activity 6y ago by L.Dutch - Reinstate Monica‭

Question weather astronomy
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Q&A What's an astronomical event which happened about 10,000 years ago, which humans could have noticed?

Bob is older than he looks. Specifically, even though Bob looks like he's in his twenties or thirties (it's hard to tell), he was actually born in Europe about ten thousand years ago, long before ...

11 answers  ·  posted 6y ago by Tanner Swett‭  ·  last activity 6y ago by Tanner Swett‭

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Q&A How can I feed an entire population on corpses?

In the grim darkness of the far future, there is only war. The world has become a barren wasteland that is inhospitable to the the human race, which has been forced to take residence in hive cities...

5 answers  ·  posted 6y ago by Incognito‭  ·  last activity 5y ago by Incognito‭

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Q&A Lifespan of abandoned buildings

I'm exploring a post-apocalyptic world and want to build a realistic scenario for the condition of abandoned ruins. What would you estimate to be the lifespan of the following building types? And...

4 answers  ·  posted 6y ago by T Nguyen‭  ·  last activity 6y ago by T Nguyen‭

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Q&A How to mitigate high infant mortality rates in a space colony

Judging by the majority of answers from this question: What would be a logical reason to explain space based families having more children than an earth based one the spacers are going to have lots...

4 answers  ·  posted 6y ago by Celestial Dragon Emperor‭  ·  last activity 6y ago by Celestial Dragon Emperor‭

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Q&A Would an aristocratic government be feasible in a sci-fi story?

So I am interested in doing a kingdom building novel in a sci-fi universe. I was thinking of having a English aristocratic government. With the king at the top and various nobles ( Dukes, Earls, Ma...

3 answers  ·  posted 6y ago by Sam Joseph‭  ·  last activity 6y ago by Sam Joseph‭

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Q&A What's the latest we would notice the gravitational effects of incoming super massive black hole?

Assuming we are unable to see the black hole via any way such as gravitational lensing, accretion disc or whatever. This is hand wave approach just to make my setting work, due to this answer whic...

3 answers  ·  posted 6y ago by yole‭  ·  last activity 6y ago by yole‭

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Q&A What would make radio transmission unfeasible on a planet?

I am looking for a good reason to make radio communications on a planetary scale unfeasible or impossible. Short-range use is acceptable, but no transmissions should make it to orbit or over the ho...

5 answers  ·  posted 6y ago by flexneck‭  ·  last activity 6y ago by flexneck‭

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Q&A Is this station design likely to cause balance or vertigo issues?

This is a follow up to a previous question that I thought should be a new question instead of just discussing in the comments of that one. This is an idea for a space station on the surface of ...

2 answers  ·  posted 6y ago by TitaniumTurtle‭  ·  last activity 6y ago by TitaniumTurtle‭

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Q&A Are fly wheels a valid means of energy storage for powering a large space station?

This is something that was just offhandedly mentioned in a Sci-Fi book I read once and as I am now writing one myself I thought I might use it. The scenario is that I have a ship approaching a wa...

6 answers  ·  posted 6y ago by TitaniumTurtle‭  ·  last activity 6y ago by TitaniumTurtle‭

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Q&A A planet with different gravity

I am trying to find an explanation to a planet in which the gravity is not constant, thus allowing some continents to be situated 2-3 km above surface while others are "grounded" on the surface. T...

3 answers  ·  posted 6y ago by Reddy Lutonadio‭  ·  last activity 6y ago by Reddy Lutonadio‭

Question planets gravity
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Q&A Practical (and Impractical) Clothing Styles For Microgravity

What might clothing designed to be worn, long-term, in microgravity look like? For the purpose of this question there are two categories. Practical, or everyday wear, and impractical or simply fanc...

7 answers  ·  posted 6y ago by The Imperial‭  ·  last activity 5y ago by The Imperial‭